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ChopperBill
08-26-2002, 07:22
Anyone know what that little "speaker" thing is above my head in the cab? It about the size of a quarter and looks like a speaker grille. Its a "03" GMC D/A
westies
08-26-2002, 07:28
It is the sensor for the climate control air conditioner. smile.gif
Nels
08-26-2002, 08:20
You aren/t referring to the microphone for the OnStar system are you? It's on the driver's side of the overhead console near the windshield.

At least that's where it is on my 2001 LT, I haven't seen a 2003 yet.
ChopperBill
08-26-2002, 18:27
Dont have Onstar so I guess its the formetioned sensor. Thanks.
NutNbutGMC
08-26-2002, 20:03
^...It's a tweeter for the sunroof. :D
SDWA
08-27-2002, 21:55
It's the "ambient air sensor" opening. IIRC, there's a little fan assembly behind there that pulls in air from the cab and adjusts the automatic climate control (temperature) accordingly. I remember there were some problems with noisy fans, and with it right near your ear, I'm sure it doesn't take much!

Scott