Farting/Rubbing sound coming from back/fog lights (2002 Tahoe)

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texas1

TYF Newbie
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When I press the fog light button there is this weird sound coming from the back of the truck. When the fog light button is pressed, it activates something in the cargo door or the back passenger side of the car.

Other observances:

- It doesn't sound like the rear wiper, that works great.
- It no more noise after fog light is turned on for the first time starting car.
- Fog lights work great.
- Don't see a problem like this when searching forums or Google.
 

Bill 1960

Testing the Limits
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Get someone to assist you with pressing the button while you trace where the sound comes from. Maybe someone added a reverse beeper that is malfunctioning.

Or possibly an air suspension compressor.

Is it consistent, can you reproduce the symptom any time you wish?
 

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