Removing rear air suspension on GMC Envoy

If you hear a noise near the rear left tire and removing the fuse makes the noise stop, then check the SERVICE PARTS IDENTIFICATION Sticker in the glovebox for code "G67." G67 = Air Level Control suspension, a.k.a. Air Ride Suspension, or Smooth Ride (or Luxury Ride) Suspension. You hear the air compressor turning on/off that inflates the rear air bags; the vehicle does a check when it's started, and will add air when you add weight to the cargo area or add a full load of passengers.

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.

Turn Off Suspension Switch Before Jacking/Lifting Vehicle ...

repairpal.com > Problems > Lincoln > Navigator
Turn Off Air Suspension System Before Jacking/Lifting Vehicle on Lincoln Navigator. Prior to jacking or lifting a vehicle with air suspension, you must turn off thesuspension switch. The switch is generally located in the trunk or on the right side of the passenger foot well. RepairPal Verified.

GMC Envoy Air Suspension Sensor - YouTube

? 4:25
https://www.youtube.com/watch?v=mh8rieTxFEM
Sep 27, 2013 - Uploaded by klondikerabbit
In this video, I am trying to diagnose and adjust the rear air suspension sensors on a 2003 GMC Envoy. The ... images for envoy where is the air suspension switch

That means the air has left the shocks. The compressor may have a bad fuse or have stopped working all together. The level sensor may not be operating either.
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air compressors do not operate below 28 degrees you have to get them warm first I assume that your compressor is under your hood as long as you allow your truck to get cold or keep the air suspension your going to have this problem

I’m happy to assist further over the phone at https://www.6ya.com/expert/brock_d67526d2a834c47e

There is probably a leak in the air hoses somewhere.

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.

check the air compressor for the air bag should be around the top of engine

That tells me everything is working correctly although you have an air leak in the system somewhere.