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Vibrating noise from microphone?

kgornek

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kgornek Enthusiast

kgornek

Posted
Posted

My Tahoe is equipped with Onstar and I assumed that the speaker looking grill thing above the driver seat was the microphone for the Onstar. But now I'm not so sure. I have read else where on this website stating that it is a small fan for the heating unit. (?) I have the computer controlled heating system option but use it in the manual mode most of the time... (85%)

 

And lately, I notice when I first start the truck, that there is a vibrating noise coming from that little speaker looking thing. It took me a long time to figure out where it was coming from, and now that I know, I'm not so sure I know the purpose. It will eventually stop after a minute or two and doesn't seem to be causing any problems that i know of.

 

Can anyone fill me in on what exactly this is and how it works in conjunction with the heating system if it is truly a small fan? I'd also be interested if anyone else has/had this problem and how they resolved it. Thanks all!!

 

:smash:

Taaaaaaahoe? Enthusiast

Taaaaaaahoe?

Posted
Posted

Its not for onstar.. Thats the black thing next to your map lights by your visor.

Its some type of sensor...not so sure its a fan, but there is also one in the rear of the tahoe if you notice too.

Can't help about the noise...but its not for onstar.

 

mike

01Burb Enthusiast

01Burb

Posted
Posted

Yup, mine is noisy. Sounds like buzzing from a speaker but it is the fan. Gotta take it in.

 

The common concensus is that it is a thermostat for the auto HVAC and drws air in via the fan..

  • 2 years later...
nardeezy Enthusiast

nardeezy

Posted
Posted
Yup,  mine is noisy.  Sounds like buzzing from a speaker but it is the fan.  Gotta take it in. 

 

The common concensus is that it is a thermostat for the auto HVAC and drws air in via the fan..

 

 

 

 

I have the same issue, is there a way to resolve the noise, it's terrible! Or, if any of you took it in to the dealer how much to repair it?

ChevyTech007 Enthusiast

ChevyTech007

Posted
Posted

It is the in-car temp sensor that is making noise. It has a small fan to draw air over the sensor. No big deal to change. The molding and sunshade have to be removed and the headliner pulled down. I would charge about 1.0 hour, not sure what the part cost.

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