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Old 03-06-2010, 10:49 PM
Olbird Olbird is offline
Join Date: Oct 2008
Location: Washington
Posts: 5
Default 2006 C4500 Auxiliary Air Compressor

Sometimes the Auxiliary Air Compressor for the seats stays running when you turn off the ignition.

It does shut off when pressure is reached so pressure switch is working within the high and low range, when this happens I have to turn ignition on and off sometimes to stop.
I went out today and heard compressor running to fill tank while truck was sitting not running and parked in driveway.

Can the air compressor relay get stuck and keep power going to compressor with the key off.
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Old 03-07-2010, 09:45 AM
Mark Rinker's Avatar
Mark Rinker Mark Rinker is offline
Join Date: Jun 2003
Posts: 5,812

Sounds like a bad relay. Not sure where that relay would be located...
2011 Chevrolet Tahoe 5.3L daily driver
  • Previous owner of two 1994 6.5L K3500s, '01, '02, and '05 6.6L K2500s, '04 C4500, '06 K3500 dually, '06 K3500 SRW, '09 K3500HD SRW, '05 Denali
  • Total GM diesel miles to date : ~950K
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Old 03-19-2010, 08:04 AM
Tom2010 Tom2010 is offline
Join Date: Jan 2010
Posts: 10

Yes, a bad relay can power the air compressor without input from the pressure switch. The relay should be located right by the air compressor.
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