03 Yukon Buzzing Noise At Start Up.

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Techno Blockhead

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03 Yukon SLT Buzzing Noise At Start Up.
When I start my vehicle after being parked for awhile, I hear a buzzing noise from my vehicle while sitting inside. The noise subsides after driving for 5 minutes or so. Is this noise from my auto leveling compressor? This buzzing noise appears as if it is getting louder now that it is colder outside. If a quick start up is done and vehicle moved to the garage I can hear the buzz come to a stop about 1 second after turning the engine off. Any ideas what causes this noise ?

TIA

Mike
 
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