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Q: 04 GMC Envoy has been lowering in the rear and not going back up anymore? on 2002 GMC Envoy

it has been doing this occasionally in the fall but now it's winter and it's been happening more often. This morning it was all the way down like a low rider and will not come back up even with the push of the rear air compressor manually? Any suggestions? Mechanic said its a complicated system and cannot get it to inflate manually?
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Sounds like the pump may not be coming on which could be caused by a bad fuse, faulty pump, or faulty wiring. If you can hear the pump running there may be a leak/hole in the piping or in the air bag itself.
Thanks for the advice. Mechanic said he's ordering a new compressor. He tried to get it to inflate so he can check it but it wouldn't inflate! I think it's more than the compressor but I will try and see what he says! Cha ching!
What happens to the system is a small leak occurs and causes the compressor to overwork and fail........I would diagnose for a leak after the new compressor is installed......If you have problems try my shop......good luck!
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