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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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.
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.
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
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.