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2004 GMC Envoy XL SLE 4dr 2WD

2004 GMC Envoy XL
Trim Info:
Rear Wheel Drive, 4 Door
15 mpg city / 19 mpg hwy
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April 5, 2010, 5:46 am

AutomotiveForums M

Question: How to solve suspension sag issue?

I have deflation of the automatic load-leveling rear suspension. Sometimes it will stay up for a day or so, other times, 20-30 minutes after the vehicle is shut off, it slowly "squats" to the bottom of the suspension. Suspension re-inflates upon starting car, sometimes it takes a few minutes for the air pump to start.

Also, the car will fall to the low point of the suspension while driving. Sometimes it will re-inflate while driving, other times it will not inflate until the car is restarted on next use.

This weekend, I replaced both axle sensors and the inflation pump assembly. Now, the car squats after about 20 minutes of being turned off. I have checked the accessory inflator Schrader valve inside passenger compartment, no air leak found. Problem still exists, what next?

April 5, 2010, 8:04 pm

Tyler O

Sounds like any air leak in the system. How did you check for leaks?

Usually if you spray a chemical like simple green over the lines and bags you can find any leaks.

It could also be a check valve somewhere in the system.

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