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The compressor is 600 bucks. If you can hear it running, then one or more plastic air lines going up to each shock is cracked . The level sensor may not be turning the compressor on. If you have experienced high water or a lot of snow and salt the system needs to be looked at to see what failed.
The compressor is in front of the muffler under the car. The parts cost 600+ for the compressor alone. Getting at it is another thing. You have to raise the car pretty high to get to the mounting bolts.
Check the air lines for leaks especially around the right rear tire area. chances are the flat tire severed or pulled loose one of the lines from compressor
There has been a service bulletin for that type of concern. Here is what it states.
Suspension - Rear Suspension Is Low/Sagging/Uneven
Notes
ENGINEERING INFORMATION
Bulletin No.: 06-03-09-006B
Date: December 15, 2008 Subject: EI06006 - Rear Suspension Uneven, Sagging, Low (Recalibrate Air Spring Sensor)
Models: 2006-2007 Buick Rainier 2006-2007 Chevrolet TrailBlazer SS 2006-2007 GMC Envoy, Envoy XL 2006-2007 Saab 9-7X
with Suspension Pkg - Rear Load Leveling (RPO G67)
Supercede:
This bulletin is being revised to update the labor operation in the warranty information. Please discard Corporate Bulletin Number 06-03-09-006A (Section 03 - Suspension).
Condition
Some customers may comment on the rear suspension being uneven or sagging.
Correction
DO NOT REPLACE THE COMPRESSOR.
Based on technician feedback, engineering has determined that the customer's concern can be corrected by recalibrating the air spring sensor. Refer to the Trim Height Uneven or Low diagnostics and Air Spring Sensor Calibration procedure found in SI.
Don't think you can, even if you were to put air from and outside compressor there is no way to keep it from leaking back out. If the compressor is bad, you really have no option but to replace it.
You have an air suspension in the rear and apparently the leveling sensor is not working correctly and telling the compressor to come on too long. A mechanic will need to check the air suspension out.
Just behind right rear tire up in the wheel well. Air inlet is inside right rear quarter near the accessory inflator. Compressor runs 3 lines one for the accessory inflator and one for each air bag.
THere are also 2 sensors, one on each trailing arm that senses load and then raises and lowers accordingly.
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