2002 GMC Envoy Rear air spring problems

HATEMYENVOY

MEMBER
2002 GMC ENVOY
6 CYL
4WD
AUTOMATIC
150,000 MILES

I have a 2002 Envoy that the rear compressor started sounding very bad and running more than it used to, now it wont raise the rear of the truck at all. Is there a good DYI way to test the compressor after it is off the truck before I buy a new one for $$$$$$$?

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MERLIN2021

MECHANIC
17,250 POSTS

REAR OF VEHICLE SITS LOW, ELECTRONIC CONTROLLED AIR SUSPENSION (ECAS) COMPRESSOR RUNS - WILL NOT LIFT REAR TO OPERATING HEIGHT (REPAIR ECAS COMPRESSOR WITH CHECK VALVE SERVICE KIT)
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TECHNICAL SERVICE BULLETIN
Reference Number(s): 02-03-99-001 GMC: 2002 Envoy/Envoy XL (New Body Style) with Electronically Controlled Air Suspension (RPO G67) OLDSMOBILE:2002 Bravada (New Body Style) SECTION:03 - Suspension Related Ref Number(s): 02-03-99-001
Rear Of Vehicle Sits Low, Electronic Controlled Air Suspension (ECAS) Compressor Runs - Will Not Lift Rear to Operating Height (Repair ECAS Compressor With Check Valve Service Kit)
Some customers may comment that the rear of the vehicle sits low and will not return to normal operating height. The customer may be able to hear the ECAS compressor running.