• If you currently own, previously owned or want to own an Avalanche, we welcome you to become a member today. Membership is FREE, register now!

Anybody knows what this is?

Dluvr22

PM 2014
PM 2013
Full Member
Joined
Jul 27, 2008
Messages
2,247
Location
Minneapolis, Minnesota
imagerebe.jpg

Does anyone know what this is and what it does?
It is in the headliner right over the drivers seat and a bit to the left in my 02 avalanche.
I noticed that when I first start my truck in the morning and the engine is cold, I get a buzzing sound from there.
It is not so loud as to irritate the driver and some may probably not hear it but I do.
Either my brain eventually tunes it out or it just goes away after a while. I don't know when it actually stops buzzing but I just realize as I am driving along that the noise is gone.
Any ideas
I'd love to know.
Thanks

 

TLB

PM 2014
PM 2013
PM 2012
SM 2011
SM 2010
SM 2009
SM 2008
SM 2007
SM 2006
SM 2005
SM 2004
SM 2003
Full Member
Joined
Sep 23, 2002
Messages
2,117
Location
Essexville, MI.
That question has been asked way back in 02.
 

Dluvr22

PM 2014
PM 2013
Full Member
Joined
Jul 27, 2008
Messages
2,247
Location
Minneapolis, Minnesota
Hmm
I always thought the mic for OnStar was the little black piece that clipped on the side of the overhead console with the dome lights.
onstarmic.jpg

What is that then?
Or did OnStar utilize 2 mics?

I am now having ideas to re-purpose that Onstar mic for my Car PC voice commands as it is in the ideal location.
after all GM would know the acoustics as they built the truck.
 

MS03 2500

PM 2017
PM 2015
SM 2014
PM 2013
PM 2012
SM 2011
SM 2010
SM 2009
SM 2008
SM 2007
SM 2006
Full Member
Joined
Oct 17, 2005
Messages
38,663
Location
Lexington KY
Amibiet temperature sensor for the a/c.

Probablt the wrong spelling cause I'm  posting from my phone
 

Dluvr22

PM 2014
PM 2013
Full Member
Joined
Jul 27, 2008
Messages
2,247
Location
Minneapolis, Minnesota
Thanks
I just found it in another post for 02' as TLB said.
I would have done a search earlier but did not know what to look for in my search.
I am reading up now on why it is buzzing and if that is normal.
 

Nick@Night

PM 2013
Full Member
Joined
Jan 2, 2004
Messages
504
Location
Peoria, IL
Dluvr22 said:
Thanks
I just found it in another post for 02' as TLB said.
I would have done a search earlier but did not know what to look for in my search.
I am reading up now on why it is buzzing and if that is normal.

Document 1639237 sez to remove sensor, then re-seat to see if the fan binding goes away.  If not, replace.

Nick
 

MS03 2500

PM 2017
PM 2015
SM 2014
PM 2013
PM 2012
SM 2011
SM 2010
SM 2009
SM 2008
SM 2007
SM 2006
Full Member
Joined
Oct 17, 2005
Messages
38,663
Location
Lexington KY
There is a fan in it that sometimes goes bad.
 

MS03 2500

PM 2017
PM 2015
SM 2014
PM 2013
PM 2012
SM 2011
SM 2010
SM 2009
SM 2008
SM 2007
SM 2006
Full Member
Joined
Oct 17, 2005
Messages
38,663
Location
Lexington KY
Most folks think it's a speaker because of the grille, but there is a little fan that sucks in air across a sensor and it tells the HVAC how warm it is inside the cabin and it adjust the temp on the heater. If you do like me and drive with the window open a bit the heater will cook your feet cause it thinks it's cooler in the cab than it really is.
 

Durwin

Charter Member
Full Member
Joined
Apr 8, 2002
Messages
1,177
Location
Sacramento, California
I did a search and received this thread as I now have the buzzing on my 02.

Does anyone have the GM name for the fan or better yet the part number? I need to get my headliner replaced anyway.

Nothing like reviving an old thread.
 
Top