Buzzing noise coming from headliner

[405landlord]

There is something in the headliner above my head, about the size of a half dollar that has started buzzing. It is annoying as hell.

 

What is buzzing? Can I fix it because I am out of warranty? How much will it cost?

 

Thank you in advance for your help.

[Dave in Mpls]

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.

 

Please follow this diagnosis process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.

 

 

 

GM bulletins are intended for use by professional technicians, NOT a "do-it-yourselfer". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.

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Document ID# 1639237

[00hoe]

I am having the same problem with my tahoe. It sounds like its vibrating on the passengers side just behind the sunroof. The vibration seems to go away if I push up on the area that is vibrating.