My Envoy has a dragging tail. The compressor seems to run but the rear of the vehicle sits down on the stops. Looks like a low rider including the back breaking bouncing ride. An auto repair shop (reputible one) looked at it when it first started to leak down and could not find the problem. Where should I start? Thanks for your help!!
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The tailgate assembly requires regular lubrication and adjustment in order to keep functioning properly. If it has stopped functioning, follow the manufacturer's recommendations for periodic lubrication and adjustment.
There has been a service bulletin for that type of concern. Here is what it states.
Suspension - Rear Suspension Is Low/Sagging/Uneven
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)
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).
Some customers may comment on the rear suspension being uneven or sagging.
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.
The air bags should be strong and not leaking themselves. It may be a valve on the bags or the plastic line going to the back that is leaking.
Some soapy water sprayed on the air ride items may show bubbles from where its leaking. Like checking a tire for leaks.
is it possible you have the air shock style suspention you can tell by the large rubber boot on the shock if so one could have a leak and your hearing the on board compressor running constantly 220/min seems mechanical hope this helps
The tools are under the second row seats. The hole for the spare tire lowering mech. is above the rear bumper when you lift the tail gate. Put the proper tool down the hole, turn counter clockwise, lowers spare. Reverse to bring up.