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Heater Fan Issues

MTCobra

Full Member
Joined
Aug 13, 2015
Messages
34
Location
New Baltimore, Michigan
About a week ago, my fan quit working. I could still feel heat, but no forced air. Checked the fuses...all good. Tried different settings (Feet, vent, defrost), but no dice. Occasionally I could hear a slight clicking but not much else. Lowered the temp to 65 and clicked A/C and all it did was flash and go off. Then this morning I stopped for a cup of coffee and left the vehicle running and when I got back in the truck, it was blasting away like it used to. Before I take it in and spend an arm and a leg to diagnose the issue, I thought I would ask you all if you have any advice. I am wondering if I have a short, bad relay or bad connection. Your thoughts????
 
Could be bad fan motor too.
or bad fan controller thingy that fan is plugged into.
 
Quick follow up on this. After much research, it turns out that Chevys are notorious for having their Blower Motor Resistor go bad. Bought a new one and replaced it in 10 minutes. Held my breath but no joy when I started my truck up. Tried every setting, every fan speed and still nothing. I even pulled out the three fan relays on the fuse box and put them back in. Shut the hood and stood there baffled and the fan suddenly came to life, although it sounded like it was struggling. After a few minutes I lowered the fan speed it sounded terrible so I think its the fan motor. I have an appointment next week to have it looked at so I will monitor it for now and keep the appointment just in case. Too bad they are charging me $96 to diagnose it, but I will need the fan during the summer so might as well fix it now.
 
Heck a new fan might be less then $96
 
Blower motor is Part 9 on this diagram https://www.gmpartsdirect.com/auto-parts/2013/chevrolet/avalanche/black-diamond-ltz-trim/5-3l-v8-flex-engine/hvac-cat/blower-motor-and-fan-scat
$140 after shipping through gmpartsdirect.  GM part# 22741027

$93.46 on amazon  https://www.amazon.com/ACDelco-15-81683-Original-Equipment-Conditioning/dp/B004944YJG/

It appears fairly simple to replace.

Guys, can he pull the old motor and apply 12v to verify it is bad before dropping $100 to buy a new one? MTCobra if it were me I'd buy from Amazon and give the new motor a shot!
 
Did you ever get this sorted out? Having very similar symptoms that come and go and can't get it figured out.
 
Did you ever get this sorted out? Having very similar symptoms that come and go and can't get it figured out.
I had the same exact issue with mine and it was the resistor. Since I bought an aftermarket one from eBay I had to wire it using a jumper set up.
 
I had the same exact issue with mine and it was the resistor. Since I bought an aftermarket one from eBay I had to wire it using a jumper set up.
Thanks for the reply, I already did the resistor with an OEM replacement and still having problems.
 
Thanks for the reply, I already did the resistor with an OEM replacement and still having problems.
Check the blower motor would be my next guess. Not sure on the 07 but on my 04 it just screws on and off with a quarter turn. To test it connect some leads to the positive and negative terminals on the battery and attach the negative to the negative on the motor and tap the positive to the positive on the motor. Sometimes when the motor starts to go bad it spin but at a very slow rpm.
 
My blower motor stopped working on High then for a while it would not work on any setting but after some days would come on by itself.
I replaced the resistor and it now works on all settings except High (5)
Any suggestions, have had the motor out and runs normal. But need to get that high speed operational.
 
maybe bad resistor?
 
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