Envoy rear sagging

SOURCE: Removing rear air suspension on GMC Envoy

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.

SOURCE: m rear heat in my03 envoy blows cold air

There is a service bulletin for poor rear heat on these models.The bulletin number is 05-01-37-002A.The part numbers are 89024885 for 4.2 engine and 89024886 for the v8 engine.It is an auxiliary pump the helps the coolant flow to the rear.The a/c system has to be recovered so I don`t think you can do this at home unless you have an a/c recovery machine.Hope this helps.Good luck.

SOURCE: I have an 06 gmc envoy denali xl and i'm having a rear end saggin

There is a bulletin for this problem.You have to go to the dealership and have the air spring sensor calibrated.Only the dealers can do this calibration.It does not take long to calibrate a vehicle.Unless they find a different problem.Hope this helps.Good luck.

SOURCE: 2002 envoy rear suspension has collasped. The

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

SOURCE: locating a leak in ride control for 03 yucon

Try spraying soapy water on the connections, then wait to see if the liquid bubbles up. Probably all you need. If it is a really slow leak can get a leak detector fluid for natural gas lines, but it costs about $8 at Home Depot. It stays on the connection and foams up if there is any leak at all.