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Author Topic: Fan switch works on high only...New Pics....  (Read 35091 times)
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enkeiavalanche
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« on: 06/01/06 07:38 PM »

I've along with a few other people on here have had this problem.. The Fan for the AC/Heat on my 02 Av only works on High... I took apart the contrals tonight to clean and they still don't work...

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« Last Edit: 06/02/06 04:26 PM by enkeiavalanche » Logged
enkeiavalanche
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« Reply #1 on: 06/01/06 07:39 PM »

Back..
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enkeiavalanche
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« Reply #2 on: 06/01/06 07:41 PM »

Switch taken apart..  

Someone said there is a Resister by the heater box to replace.. Does anyone have a part # and Picture for a 02...Thanks..Glenn
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ItsStopher
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« Reply #3 on: 06/01/06 07:56 PM »

If equipped, remove the IP sound insulator.
 
Disconnect the electrical connection from the blower motor.

Disconnect the electrical connection from the blower motor resistor.

Remove the blower motor resistor retaining screws.

Remove the blower motor resistor.
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enkeiavalanche
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« Reply #4 on: 06/01/06 07:58 PM »

Thats over by the 02 Cabin Filter right?..  Thanks I will look in the morning..Do the dealers stock this part or should I get it cheaper at Pep boys..?
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« Reply #5 on: 06/01/06 08:02 PM »

yup, to the right of the filter, GM part # 15305077
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enkeiavalanche
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« Reply #6 on: 06/01/06 08:04 PM »

Thanks  I owe you a beer before you move... Wink
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« Reply #7 on: 06/01/06 08:22 PM »

I can not believe they are still using a design I found in my first Chevy, 1975 K5 Blazer. I went through at least 7 of them over 18 years. I used to go to the junk yard and get them, use it for a year or so and then replace it again.

Simple design, but it is probably placed in the housing that is now in the passenger foot well.

Look for a couple of hex headed nut screws and pull out a funny looking piece with a few spring like thingys (thanks YGGM). You'll find one or more burnt off or very discolored ones.

I think I may have attempted to re-solder them once ot twice, but it never worked out. Junk yards were much cheaper than OEM from GM and no one back then, through '92 anyway, ever had the part.

I've been doing a lot of re-soldering tonight!

I just saw the posting with the rest of the nomenclature. I forgot to add there will be a wire loom clip going into it also. That's the stuff!
« Last Edit: 06/01/06 08:30 PM by Cat Dancer » Logged

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« Reply #8 on: 06/01/06 10:15 PM »

I paid $19.20 for mine from the dealer and they had it in stock.

Part # 89018596 Resistor 9.216  ( I have an 03 )

RON
« Last Edit: 06/01/06 10:18 PM by RONALDFS » Logged

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« Reply #9 on: 06/02/06 02:05 AM »

GMPartsDirect.com was down last night, now it is up and the PN I gave you does not come up. The PN ron posted came up, just be sure it will work on a 02.

yup, to the right of the filter, GM part # 15305077

I paid $19.20 for mine from the dealer and they had it in stock.

Part # 89018596 Resistor 9.216 ( I have an 03 )

RON
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« Reply #10 on: 06/02/06 02:31 AM »

found this doing a search...

15305077 - RESISTOR      15305077

               Replaced by 89018597 or 89018596    
Detailed Description
For 2002 and prior vehicles use part number 89018597
For 2003 and newer vehicles use part number 89018596

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« Reply #11 on: 06/02/06 04:19 AM »

found this doing a search...

15305077 - RESISTOR      15305077

               Replaced by 89018597 or 89018596    
Detailed Description
For 2002 and prior vehicles use part number 89018597
For 2003 and newer vehicles use part number 89018596



 thumbs_up
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enkeiavalanche
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« Reply #12 on: 06/02/06 07:22 AM »

Thanks guys.. thumbs_up Looks like I'll be doin some Modd'in today...Got some new tools from the wedding.. Time to use them...
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« Reply #13 on: 06/02/06 07:48 AM »

sweet.. glad you found what you were looking for.
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« Reply #14 on: 06/02/06 04:31 PM »

Ok I spent some time on this Only because I did not have the right socket.. banghead  In the 90+ Temps here today I was working on it before I found out I needed a 7/32 And Guess what?  Home Decrap...  No longer sells that size by it self.. veryveryangry

Anyway A big Thanks to Mudcon at Buford Chevy for getting me the right part #89018597  Here's the pics... New switch
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enkeiavalanche
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« Reply #15 on: 06/02/06 04:34 PM »

Where it is on a 02 Av..
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enkeiavalanche
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« Reply #16 on: 06/02/06 04:36 PM »

You will need that 7/32 socket to take down the cover and the part.. And at least 1 nut on the Fan houseing..
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enkeiavalanche
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« Reply #17 on: 06/02/06 04:38 PM »

The old unit
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« Reply #18 on: 06/02/06 04:40 PM »

Old one and new one.. If you have the right tools this fix should only take an hour...Thanks again everyone..... Wave
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« Reply #19 on: 06/02/06 04:47 PM »

happy to hear you got it fixed Glenn, thanks for the pics
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« Reply #20 on: 06/02/06 06:00 PM »

now time for  Cheers!
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enkeiavalanche
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« Reply #21 on: 06/02/06 06:58 PM »

Come on up this way and it's yours.. Thanks again to ItsStpher and Mudcon..... You rock!
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« Reply #22 on: 06/03/06 10:33 PM »

Glad you got this fixed, Will really help other members with the same problem.

Sam
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« Reply #23 on: 06/20/06 11:13 AM »

Hello,
I have the same problem in my o2 AVY, only my fanspeed 1 and 2 are not working.

 Help me!

Can anybody give me a little more explanation about how to get to resistor....

Do i need to take the complete dash out or not....

 Help me!
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« Reply #24 on: 06/20/06 02:08 PM »

Hello,
I have the same problem in my o2 AVY, only my fanspeed 1 and 2 are not working.

 Help me!

Can anybody give me a little more explanation about how to get to resistor....

Do i need to take the complete dash out or not....

 Help me!

For 2002 the GM part number is 89018597(thanks wildfire), You do not have to take the dash apart, it is under the glove box just remove the screws in the middle and on the right JUST loosen the one on the left, then just let the cover rest on the floor, replys #16 - 17 have good pics of what you will see.


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« Reply #25 on: 06/20/06 02:18 PM »

glad to see you got it fixed Gleen

good pics...

Btw, you could have went to Sears to get that 1 socket
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« Reply #26 on: 06/21/06 06:29 AM »

For 2002 the GM part number is 89018597(thanks wildfire), You do not have to take the dash apart, it is under the glove box just remove the screws in the middle and on the right JUST loosen the one on the left, then just let the cover rest on the floor, replys #16 - 17 have good pics of what you will see.






Thanks allot I've got the resistor out and now i need to find a good place that sell them and wont to sent them to Belgium.......

Because i think here in Belgium it will be to expensive.

Do you know a good shop for me....

Here are some pics of the resistor.



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« Reply #27 on: 06/21/06 08:13 AM »

If you can not get it let me know and I will get one here and mail it to you. Send me a pm and we can work out the details.
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« Reply #28 on: 06/21/06 09:17 PM »

If you can not get it let me know and I will get one here and mail it to you. Send me a pm and we can work out the details.


I am going to the local GM dealer in my town today.

I will let you know that i need one or not.
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« Reply #29 on: 06/23/06 09:13 AM »

Found one at my local dealer.... and its working on all speeds again Cheesy

Got it for 30 that's a reasonable price i guess.


Thanks allot ItsStopher for your guidance. Wave


See you later until we meet again.
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« Reply #30 on: 07/16/06 07:40 AM »

Mine has just gone too thanks for the information  03z66
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« Reply #31 on: 12/02/06 07:43 AM »

Great thread!

I had to replace my wife's Cavalier's resister and I was afraid it was going to be that hard.  The Cavalier had it behind the fan, horrible placement and hard to reach.

Looks like the AV is going to be a piece of cake.   Thanks to all the great posters on this thread.  Thanks everybody!!
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« Reply #32 on: 12/02/06 04:27 PM »

Perfect timing on finding this thread. Speed 1 and 2 dont work on my 02. Thanks to all for pics, part #'s and comments on the removal and install of this part.  Cheesy This will be another money saving, do it yourself project! I love it!!   Woohoo!  Cyrus.
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« Reply #33 on: 12/06/06 07:58 PM »

Thanks everybody, especially everyone who posted pictures, part numbers, and prices.  I got my fan working again.  Only took about 30 minutes in the 35 degree temps we were having today in Michigan! 

I had to remove the round cap covering the blower motor to get to the plug, and surprisingly it was easy to gt back on.  I thought for sure it wouldn't be. 

Also, for 2002 owners, this might be a good time to replace the HVAC air filters since the main cover is off.

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« Reply #34 on: 12/10/06 04:37 PM »

Replaced the resistor today. The old one looked just like the pic on reply #26. It appears to be moisture damaged the electrical pathways on the circuit board.  While I was in there I changed the cabin filters.  Oh yeah.... $48.00 for the resistor from the dealer.   chevy
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« Reply #35 on: 12/10/06 04:56 PM »

I can not believe they are still using a design I found in my first Chevy, 1975 K5 Blazer. I went through at least 7 of them over 18 years. I used to go to the junk yard and get them, use it for a year or so and then replace it again.

Simple design, but it is probably placed in the housing that is now in the passenger foot well.

Look for a couple of hex headed nut screws and pull out a funny looking piece with a few spring like thingys (thanks YGGM). You'll find one or more burnt off or very discolored ones.

I think I may have attempted to re-solder them once ot twice, but it never worked out. Junk yards were much cheaper than OEM from GM and no one back then, through '92 anyway, ever had the part.

I've been doing a lot of re-soldering tonight!

I just saw the posting with the rest of the nomenclature. I forgot to add there will be a wire loom clip going into it also. That's the stuff!


That design was changed in the 03 AUTO Air and likely prior MY's using that system. Manual A/C fans use the resistor still in the 03 (likely for the next few MY's too).

The AUTO air uses a solid-state relay-like device. A MOSFET (Metal Oxide Semiconductor Field Effect Transistor), configured to vary the on/of time (duty cycle) of the blower motor. In the Av, it's in the (AUTO AIR) HVAC controller, in the Trailblazer, it's in the UBEC and looks like the other relays.
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« Reply #36 on: 07/07/07 07:05 PM »

Hello all!

I have an 05 that stopped blowing air while it was 113 degrees outside banghead.  I still have power to the controls and I can hear the clutch kick in.  So I am guessing that this is my problem as well? 



Will it be the same part #?

Are the parts Dept's open on Sundays? If not where can a guy get after market ones?


Thanks!!!

ETA: the air is not computer controlled, just the normal old style.
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« Reply #37 on: 07/07/07 11:49 PM »

OK pulled it out,  It melted the big black wire in this plug.  Where would I find the burned fuse?



My resistor:



What do I need to do to get my A/C working ASAP again?

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« Reply #38 on: 07/08/07 12:36 AM »

Hello all!

I have an 05 that stopped blowing air while it was 113 degrees outside banghead.  I still have power to the controls and I can hear the clutch kick in.  So I am guessing that this is my problem as well? 



Will it be the same part #?

Are the parts Dept's open on Sundays? If not where can a guy get after market ones?


Thanks!!!

ETA: the air is not computer controlled, just the normal old style.
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« Reply #39 on: 07/11/07 09:19 PM »

*Bump* I just wanted to bring this thread back up...

     I went to pump gas today. Waited in line chillin with the AC on. Pumped gas, started up,  and the HAVC fan didn't work on any of the speeds. 10 minutes of diagnostics in the parking lot of BJ's and I ruled out the fuse, and the HVAC controls. I yanked off the Passenger floor HVAC access cover, gave the wiring harness under the resistor pack a jiggle and it miraculously started working again. I want to investigate the root cause of failure. I detected sparking/arking in the wire bundle at the connector. There is a gremlin there and I want to expose him before I slay him! Incedentally Yes I was able to get it working there in the parking lot. Why should a man suffer on the 2nd hottest day of the summer in Baltimore. I mean I work in a kitchen but still!
     Anyway I am bumping this thread just in case I need to go parts shopping tomorrow

JB
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« Reply #40 on: 07/12/07 01:54 PM »

     Oh Yeah I certainly found this picture in my truck today...

     The black wire grounded out on the resistor pack. I ended up having to replace one resistor pack at a little under $50 without my gm wholesale discount... but there was no way I was traveling back from Baltimore to NC without AC! However I did get the satisfaction of fixing it right in the driveway of the dealership. I would have done it in less than 20 minutes. But I had to dig out the semi melted metropack connector on the black wire and replace that. The dealership was cool they threw that in for free. Well it was either that or fight the computer for 5 minutes to figure out how much i costed. To think someone might have paid their dealership to diagnose "HVAC blower motor failure" Then charge them $150. BLAH chevy
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« Reply #41 on: 07/12/07 02:59 PM »

glad you got it figured out  Thumbs up!
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« Reply #42 on: 08/16/07 06:17 PM »

thanks guys for all your help!

i have an 03 and the blower quit today at all speeds.  thats ok it was only 107 today!  i had the same problem with the meltdown on that black connector, except about half of it was melted.  that explains the burning smell

after searching and finding this post i diagnosed it in about 5 minutes.

thanks again for your help!

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« Reply #43 on: 08/17/07 06:21 PM »

ok i bought a new resistor for $49.00.  i also needed the black connector plug because it had melted also.  it was only $95.00!!!  thats right $95.00!  couldnt believe it.  i was thinking he was reading it wrong, more like 95 cents!  its just a plastic plug with some wire leads.  i still thought he was wrong so i called all chevy dealerships in town and the same price is what i found.

when i called henserson chevy, they said $95.00, but we can do better then that.  he sold it to me for 80 which i thought was very nice.

anyway i got it installed and now speed 5 doesnt work.  i figure they must have sold me the wrong resistor.  i gave him the part number listed in this thread and he said its no good.  i will go back tomorrow and see what i can find out and be sure to post the results.
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« Reply #44 on: 08/18/07 03:26 AM »

hope you get it fixed, let us know what the new part#'s are
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« Reply #45 on: 08/18/07 06:40 PM »

ok got it fixed. 

while installing the new connector plug, i touched some metal and it shorted out, blowing the 40 amp fuse under the hood.  i replaced that and now all five speeds work.  from what i understand,  the resistor controls speeds 1-4, and speed five basically bypasses the resistor for direct battery power, which comes from that 40 amp fuse under the hood.  those fuses have a clear top so you can see if they are blown.

for the 03 av 1500 the resistor part number is- 89019089 and was $49.00.

i dont know what the part number is for the connector plug since i threw out the bag it came in. i do know it cost $95.00.

the dealer said that they sell one a day at least.  i guess they go out often but they say this is a new one that should fix the problem.

hope this helps someone in the future!

PM me if you have any more questions.

thanks
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« Reply #46 on: 08/18/07 07:14 PM »

glad you got it working, thanks for the part number  Thumbs up!
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« Reply #47 on: 10/20/07 10:56 AM »

I almost took my Avy to the shop until I read this post.  You guys have made my weekend!

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« Reply #48 on: 10/20/07 11:18 AM »

I almost took my Avy to the shop until I read this post.  You guys have made my weekend!





Congrats on your first post  Thumbs up!
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« Reply #49 on: 12/06/07 10:07 AM »

didn't want to start another topic.    .    .    .    but I have a 03 Av 1500 4x4 40,000 miles .    .    .    .    it has Manual ac/heater controls (ticks on dial)

My problem is the blower has a mind of it own.    .    draining battery, like everyone else's.    .    

I need to replace the Resistor.    .    .    right? I don't have a Blower control Module, because it not climate control.    .    .    just making sure


My deal is with the 40 amp fuse OUT the 1 -4 speed work, just not the 5th speed.    .    .    .    .    do I still need to replace the resistor, as last poster said resistor controls 1-4.    .    .    .    .    

also I have the 03 part number.    .    .    but should I get a 7/32 wrench?

any help before I start replacing 
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« Reply #50 on: 12/07/07 10:11 PM »

didn't want to start another topic. . . . but I have a 03 Av 1500 4x4 40,000 miles . . . . it has Manual ac/heater controls (ticks on dial)

My problem is the blower has a mind of it own. . draining battery, like everyone else's. .

I need to replace the Resistor. . . right? I don't have a Blower control Module, because it not climate control. . . just making sure


My deal is with the 40 amp fuse OUT the 1 -4 speed work, just not the 5th speed. . . . . do I still need to replace the resistor, as last poster said resistor controls 1-4. . . . .

also I have the 03 part number. . . but should I get a 7/32 wrench?

any help before I start replacing
Welcome! to the club Wave

Have you read this thread Huh
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« Reply #51 on: 12/08/07 07:28 AM »

I missed this, I will have to run through the checks you suggested.    Local shop said 4 hrs job to replace, had to remove dash, air bags.   .   ect  :laugh:

the funny thing is the heat works with settings 1 thru 4 , just not 5 with the 40amp blower fuse removed and this also stops the blower as well.    somehow the blower  is still becoming energized, with the car off and key removed???
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« Reply #52 on: 01/06/08 04:33 PM »

Just a head's up to thank you guys for re-circulating this thread!  This is awesome group and thanks to all!
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« Reply #53 on: 04/25/08 02:52 PM »

Is this the same fix if my problem is an annoying sound coming from the passenger side vent.  I have an '03 but all the fan selections work.  This noise is constant and the car doesn't need to be running in order for it to start.  As soon as I turn the key some kind of power starts this noise.  But it is definitely coming from the same area.  PLEASE HELP as I had just purchased this truck and the dealer doesn't seem to want to chase a noise and rip apart the dashboard.

Thanks....  I am new to this board and purchased my '03 Spiral Grey Avalanche, with only 29K miles a couple of weeks ago.
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« Reply #54 on: 02/17/09 12:23 PM »

i lost speeds 1-3 on my 04 found this thread and got it fixed.

Just a side note i went to partsource and they gave me the part for $31 i went to install it and it didnt fit in the bracket so i went to the stealership and they gave me the part for $71 and it also didnt fit. The guy looked on the screen and finally saw a note that said u may not be able to use the bracket so u just throw the new resistor on.

So the cheaper part was probably the right one and i just went with the oem cuz i ran out of time to do this

 banghead
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« Reply #55 on: 02/17/09 03:06 PM »

Slagfest, what was the part number you got for the 04?  30.00 sounds pretty good to me.


I'll have to take a look at what my resistor looks like now.
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« Reply #56 on: 02/17/09 03:47 PM »

Partsource just asked for make and model and gave me the resistor..when i went back i gave em the partnumber 89018596 as its listed earlier in this thread and they couldnt find a listing in their computer.

When i saw the oem one at the dealership and saw it wouldnt fit the bracket i told him the part number and he said the one he just gave me was the one.

this is what my resistor looked like

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« Reply #57 on: 02/18/09 08:57 AM »

Unfortunately, I am not able ot see a lot of the pictures posted in the forums...just white boxes.

I will check with Checker today on part and replace it in their parking lot.

Checker didn't have one in stock.  Does this one look like yours?

http://www.theautopartsshop.com/Auto+Car-USA+Parts/Chevrolet+Avalanche-1500+HVAC-Blower-Motor-Resistor.html
Link is work and family safe.

Thanks,
Ryan
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« Reply #58 on: 02/18/09 09:54 AM »

its hard to tell the difference of those two on that website. only difference i see is the holes for the bolts. The only specific question i was asked from partsource was if i had the auxillary heater for the rear seats which i dont.

dealership only had the one listing

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« Reply #59 on: 02/18/09 12:47 PM »

I called my dealer before posting and they asked me for my VIN number to determine which part as they have two. 

I don't know that mine ever worked, always just thought it was a real gentle air flow with a real quiet fan...not the sharpest crayon in the box, but that must mean i get used a lot banghead
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« Reply #60 on: 02/22/09 08:24 PM »

I was having an issue with my blower motor and took the advice found here.  Unfortunately it didn't match my circumstances.

In my 2004 1500 Z71 with cladding I have dual temperature control.  The fan setting is determined by tick marks on a digital screen.  There are probably 12 ticks total (just guessing).  Up until a little while ago, my blower would only work when the highest two tick marks were illuminated.

I went to a local auto parts store and picked up the Blower Motor Resistor based on the general description of my truck.  The resistor looks like the one in the haynes manual as well as the ones pictured in this thread.

When I removed the blower motor cover (two screws with a 7mm nut head), I immediately found out that my resistor wasn't the same as the one I bought.  For grins, I decided to see how hard it was to unclip the wire fasteners of the in place resistor.  It was hard and I didn't get them apart (either connector).

I then unscrewed the resistor to see what the burnt one looked like (two 5.5mm nut headed screws) (I doubt nut headed is a correct term, but give me some latitude here  Roll Eyes).  What I saw baffled me.  Maybe you guys can give some thoughts.

Interestingly, after installing everything back together, I started the truck to reposition it in the garage and apparently I did something to make the blower motor work again Huh

Anyway, I replied earlier that the chevy dealership said there were two part numbers for my year.  I guess I shouldn't have doubted them.  The part number given to me based on my VIN number was 89018778.

Hope someone has some info for me and that this provides some others some info as well.

« Last Edit: 02/22/09 08:27 PM by TCR1 » Logged

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« Reply #61 on: 08/23/09 10:19 AM »

Thank you so much for this thread!!! I lost all fan settings except for the highest setting. The resistor is a bit more pricey up here in Canada ($70). I did look at aftermarket resistors and was told that they don't fit properly. So I stuck with AC Delco was able to get the resistors switched out within 30 minutes!  Thumbs up!
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« Reply #62 on: 09/02/09 03:42 PM »

So glad I found this thread. Fan on my '03 Avy only worked on 3-5 until the other day when 3 went out as well. $37 later and 30 minutes of my time and all is well
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« Reply #63 on: 11/03/09 10:00 AM »

TCR1 - I have the same thing as you.  I took mine out, and the metal heat sink thing looked corroded, so I cleaned it a bit with a screwdriver (scraped the corrosion off), and put it back in.  It helped a little, but I think I still need to replace it.  Heading out to Advance Auto now to see if they have the part, as I need to pick up some Silverstar Ultra's anyway...
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« Reply #64 on: 05/26/10 01:36 PM »

I have the "only works on high problem".  From the threads, all indicators pointed to the resistor module.
I bought a new one, installed it and still have the same problem.

The only thing I have noticed is the new one had a different design for the resistor as seen in some of these thread pictures (the one with the resistor across the top),
and the one I took out looked like this one. http://i122.photobucket.com/albums/o262/Apewar/100_0202.jpg

Could it be a compatibility issue?  I ordered it against the OEM number 15305077, and thats what they sent me...

Thanks in advance for help


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« Reply #65 on: 05/26/10 02:32 PM »

 Welcome! to the club dbolo80  Wave

What year AV?
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« Reply #66 on: 05/26/10 02:48 PM »

2004 Z71 1500
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« Reply #67 on: 05/26/10 03:13 PM »

Check the 30A HTR A/C fuse in the left fuse block.
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« Reply #68 on: 05/26/10 03:21 PM »

already did..... its fine
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« Reply #69 on: 05/26/10 03:43 PM »

Do you have a test light or a meter? Check the connector for....

speed  1  12v on pin B
            2  12v on pin A
            3  12v on pin D
            4  12v on pin C
            5  12v on pin F         
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« Reply #70 on: 05/26/10 05:08 PM »

this is exactly what I am looking for to check this,  been on web looking for this info
I assume "G" is gnd or is "E" gnd"
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« Reply #71 on: 05/26/10 05:34 PM »

Just check voltages, and all were there, guess that now points back to the resistor module as the problem again....right

Thanks
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« Reply #72 on: 05/26/10 05:45 PM »

Does it still work on high?

E ground
G 12V
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« Reply #73 on: 05/27/10 06:58 AM »

Yes it works on high (but the old one did too.)
I figured "E" was ground, and as I said, all voltages present on connector.

I bought the module on-line as used but tested,  either I got the wrong module, or defective one, because if the voltages are there, and I get pass thru for High, I can't think it could be
anything else but the module.

Agree?

I want to thank you very much for your assistance on this......

bolo
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« Reply #74 on: 06/08/10 08:52 AM »

I replaced my Blower Motor Resister and all speeds work...yeah!  However, the old unit had a "cover" on it that snapped onto it.  That 'cover' doesn't fit the new resistor that was for my 2004 Avy.  I hate to admit this, but I had to use duct tape to secure the seal on it.  My question is, how important is that "cover?"
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« Reply #75 on: 06/08/10 09:29 AM »

Well I solved my issue, as I had a defective replacement module.   I also had the problem of the mounting for my 2004.  Autozone had the two hole mount for $25, but wanted $63 for the 4 hole mount.   I bought the two hole mount, and took the old "cover" and cut out the center so that I could fit over the the new design, and mounted it back in.  I already installed it so i would have taken a pic of what I did, but anyways, if you cut out the core of the OEM cover, the holes on the new one will line up with the clips on the cover, and let you mount it properly.
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« Reply #76 on: 06/08/10 09:39 AM »

Awesome!  Thanks for the suggestion dbolo80.  I appreciate it!
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« Reply #77 on: 09/21/10 12:19 PM »

I am having this same problem.  I have replaced the resistor, but still have the problem.  I talked to a local shop, and he suggested that it could be the heater control module, if my truck has one.  I called a dealership, and mine does have the control module.  They want $163 for it, and I have found it cheaper online.  But the guy at the parts counter didnt know where it is located in the truck.  Does anyone know where the heater control module is located on an 02?
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« Reply #78 on: 10/18/10 07:57 PM »

Glad I found this thread.

I have a 2002 Avalanche Z71 that I bought last November.  Speeds 4 and 5 on the fan were the only ones that worked.  I figured it was a bad blower or something so it wasnt worth fixing.  After reading this thread I went to my local chevy dealer and paid $70 for a new blower resistor.  Took me about 1 hour to remove the bad resistor and install the new one.  Most of that involved trying to figure out how to detach the 2nd electrical connection.  Once I realized to loosen 1 bolt on the blower cover, that gave me all the access I needed.

All fan speeds work now and I even changed my cabin air filters while under there too!
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« Reply #79 on: 10/18/10 08:06 PM »

70 bucks  Shocked
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« Reply #80 on: 10/18/10 09:14 PM »

70 bucks  Shocked

$67 plus tax...other local dealers wanted more

could've bought it online and saved $15 but paid more because I could get it that day
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« Reply #81 on: 01/18/11 08:50 AM »

Great thread.  Thanks everyone.

Question:  This morning all 5 fan speeds went out.  All 5 were working a couple hours earlier.  Now no fan at all.  40 amp fuse under the hood looks good.  Is the resistor still the prime suspect, or should I check anything else first?

Thanks again,
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« Reply #82 on: 03/25/13 09:28 AM »

I am having the same problem as the last poster I have all 5 fan speeds inoperable.

I've read all the threads I could find on the topic including all of this one and it sounds like the condition is pretty obvious if you have some of the low speeds out, but what if you have them all out.  I checked the fuses (10 amp and 40 amp) no issue there.

I have an 05 with the manual dual zone.

It just went on me last night so when I get home from work this afternoon Im going to pull it apart and see what I can see on the resistor and the harness, but just looking for the next step if both of those look good.  Thanks in advance.
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« Reply #83 on: 05/12/13 02:02 PM »


So as it turned out when I pulled the blower resistor out back in March it was completly wasted/corroded.  Replacing the Blower Resistor did the trick.  Here I am only just over a month later and I have all 5 speeds out again.  Pulled the resistor out and its corroded again, not nearly in as bad a shape as the one I pulled in March though.

One other thing.  The 'E' wire was melted inside the connection to where it connected to the motor resistor.  I had this in to the dealer back when it was under warrenty and I can see where someone spliced in a new wire into the plug at the 'C' connection.

Anyone have any insight there?  Two questions...why is the blower resistor already corroded?  And whats the deal with the 'E' wire?  Is splicing a new wire into the harness going to help me?  Where would I even find a new singel wire with the right metal thing on the end to replace one of them in the harness?

If I cant do that should I just get a new wiring harness...sounds like something upstream is causing it to get overheated.
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« Reply #84 on: 05/12/13 04:17 PM »

You sure you do not had a water leak in there cheeba
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« Reply #85 on: 05/12/13 05:25 PM »

Read something about a recall on this issue -- worth a check to see if your model is affected. http://chevyavalanchefanclub.com/cafcna/index.php/topic,128140.0/all.html#lastPost
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« Reply #86 on: 05/13/13 10:20 AM »

I guess a water leak is possible.  I have not noticed any water on the passenger side.  No musty smell anywhere either. 

I was just driving it and put the AC on high and noticed a burning smell so I shut it off.  Probabaly toasting another blower fan resistor if I had to guess.

I'll check out the recall now.  Thanks for the link.  I'll report back.
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« Reply #87 on: 05/13/13 07:32 PM »

I guess a water leak is possible.  I have not noticed any water on the passenger side.  No musty smell anywhere either. 

I was just driving it and put the AC on high and noticed a burning smell so I shut it off.  Probabaly toasting another blower fan resistor if I had to guess.

I'll check out the recall now.  Thanks for the link.  I'll report back.

Burning smell is an indicator of the problem the recall addresses. Chevy was honoring the recall for a certain amount of time -- my chevy dealer was great in running my vin and letting me know I was safe (didn't have an issue -- just wanted it taken care of before it ran out.) hope it helps!!
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« Reply #88 on: 07/08/13 10:58 AM »


Ok so its been a while...this is me 'checking back'.  So I took Chevylovex2 advice.  Called the dealer that serviced my vehicle when it was under warrent (tuns out it was long ago enough that they didnt have a record of it), they took my VIN said my truck was part of the recall to bring it in.  I did, no problems since.  i was armed with a copy of the recall notice (which I didnt need they were very familiar with the problem) but it went pretty smoothly.

Thanks Chevylovex2!
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« Reply #89 on: 07/25/13 04:00 PM »

It looks like i will be doing this fix soon, my 2004 1500 only works on high (5) and not at all sometimes.... which is unacceptable in 90Deg weather!

thanks for the posts and pictures! Smiley
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