My 02 has a weird buzzing sound coming out of the little speaker above my head in the drivers seat?? Anyone else have this issue?

i think its been talked about here before a few times. its not a speaker but a interior temp sensor. if you hear the buzzing, the fan inside most likely crapped out. i was able to open mine up and fix it with a little glue. Give it a try before buying a new one.

Aspirator fan...Draws air from the cabin to check temp. so your auto climate control knows how to adjust itself.
$45 part..i think they are fairly easy to replace..I think omeone here might have done it

this sound is right above my head. I put my hand over it and it shuts up.

Aspirator fan as coralfreef said...


Here is a GM bulletin regarding it...



Document ID# 1639237

Subject: Buzz Noise From Headliner Above Driver - keywords ac air aspirator cover fan grille HVAC interior microphone sensor speaker temperature vent vibration #PIT3511 - (03/29/2005)



Models: 2000-05 Cadillac Escalade

2002-05 Chevrolet Avalanche

2000-05 Chevrolet Silverado, Suburban, Tahoe

2000-05 GMC Sierra, Yukon, Yukon XL, Yukon Denali

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in the PI.

Condition/Concern:
Dealer or customer may comment that they have a buzz or vibration noise emanating from the headliner in an area that looks like microphone or a speaker.

Recommendation/Instructions:
The plastic escutcheon grill, which is round and about the size of a half dollar and located just above the driver to the left, is the interior ambient temperature sensor. The sensor is used in conjunction with the automatic HVAC (C68). On occasions, this sensor has been known to make a buzz or rattle sound. The sensor uses a small fan to pull air over the sensor. This buzz noise may be intermittent.

Although it may not be possible to alleviate all of the buzz or noise from this sensor, Engineering has found that if the sensor is installed incorrectly that it may bind and cause the fan to make a buzz noise. Remove the sensor and while doing so check for any binding. Reinstall the sensor and re-test. If the noise is still present, the sensor itself may be noisy and require replacement.

nice. thanks. My Denali did the same thing, but i thought it was an onstar speaker or something, and i changed the stereo system in it so i thought it got messsed up. Well now i know, thanks again

smack it a few times.... mine did it last december... I smacked it a few times and it never buzzed again (*knocks on wood*)

^ Second that!

funny i noticed this two days ago and wondered what it was, now i know i just have to beat it......