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I purchased a 2005 gmc sierra 1500 extended cab. what is the small speaker/grille in the headliner over the drivers head?

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Mkisner, I have a 2003 gmc 1500 extend cab. I hear a small fan running in the headliner. It's very loud when cold outside. When I press on the grille in the head liner it quiets down. After the cab warms up the sound goes away. I ask the mechanic at the dealer what in heck is that. He said it's a fan that registers inside temperature for the air/heater. They have to take the headliner down to change it. He said expensive to change because of labor so I live with it. That is the explanation that was given to me. It does look like a speaker. The On-star voice receiver is in the mirror and speakers are the radio. That's why the radio music mutes when talking to On-Star or using the truck phone. You might what to know that Verizon has a deal with On-Star to add the truck phone to you Verizon bill for $9.95 per month sharing your minute with your cell phone. Verizon will assign a new phone number for your truck. It works great and you can program voice commands for the phone. Very powerful and clear. You can't go wrong but you have to keep On-Star active. Ken

Posted on Sep 15, 2009

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GMC Products most have the option of ON STAR when buying their vehicles. I believe that this speaker is for that function, it's dual purpose
microphone and speaker. But won't work unless you have On Star service.

Posted on Aug 23, 2009

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1 Answer

Humming sound coming from the small speaker over my head ?


That "speaker looking thing" above the drivers head on the headliner is a part of the climate control system.

Here is the GM bulletin regarding it if you are running in to these issue:

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.

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