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#1
12-02-2009, 03:41 PM
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anoying noise at start up
There is a sensor above the driver seat in the headliner with what looks like a 1.5 inch diameter speaker grill. There is an obvious fan motor sound coming from it. What is this? Some kind of a/c temperature sensor with a small fan? It is on when the car is running or in ACC. Thoroughly confused on this one...
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'92 s-10 4x4 EC p/u '99 Blazer LT '99 Suburban LT 
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#2
12-09-2009, 08:04 PM
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Re: anoying noise at start up
That is a small microphone, most likely for onstar I would assume, for handsfree talking. My truck, 2000 envoy, has one too, and I know exaclty the noise your describing, but I don't have onstar.
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#4
12-11-2009, 03:42 PM
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Re: anoying noise at start up
that would be your inside air temp sensor GM part #15756446 and list for $64.98
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