Air ride suspension problems

Probly just a leak in a hose. I replaced my compressor and hoses w after market parts (not gm) for 350. My quote for gm parts w labor was$ 1200. Solved all the problems. U can get a spray bottle w soap and water and find the leak if u just want to get out a lil cheaper. Its worth paying to get it done. Do have to say it looked sweet when the bags were empty. If u live in tx I can get u in w my mechanic he does good work and he olny had my denali for 24 hrs.

The rear air bags have been acting weird for a while now, it started out only going down at night, but then it started going down all the time, even while driving, and now they wont even come up at all. I didn't know what to do, money is tight right now but I can't stand bouncing around all the time while driving. I didn't know if there was an alternative to the air bags, like if I could get something cheaper that basically does the same job? Anyways I would really appreciate any advice you could give me. Thanks

Thanks, I'll try that :)

The rear of vehicle has dropped almost to the ground. I can hear the compressor running but nothing happens. Could the compressor be worn out enough that it still works but not strong enough to air the suspension up? Dealer says I need a new compressor and air bags which is fine just seems odd that I can hear compressor running.

Thanks I will get under there and look it over for anything obvious. On the air outlet in the cargo area the gauge says I am getting a little over 30 lbs of pressure from the compressor. If that helps.

While I don't think it's relevant, I noted that one of your other members reported that their air bag problem started just after the battery went dead. In my case it was 3 days after replacing the original battery.
The problem is that, with increasing frequency, the air bags go flat over night after parking the Envoy at home. If it makes any difference, it's an XUV model. The dealer has checked the fittings for leaks and found nothing. In fact, for the two days it sat at the dealership, the rear height changed only slightly up and down due to temperature changes. When I brought it home last Friday, I left the key on and stood on the rear bumper to force the leveling system to operate. Once I got off, it settled back to what seems to be the normal ride height. It stayed fine until Saturday evening when I drove it around town on an errand. I parked it this time and just turned key off. The next morning, it was down over two and a half inches on each side. Any ideas on what to look for? I know that it has 3 solenoid valves. One for each side, and one to relieve pressure when the pump starts. Any chance one of the bag valves is hanging partially open and deflating the system?

Seems like both left and right valves would have to be sticking for the motor bleed off valve to cause the problem. If I understand the system, the pump output goes to a "header" from which pressurized air can go to the left or right air bag if the left or right solenoid is open, or to the inflation station inside the back of the vehicle. The inflation station has what looks like a regular tire schrader valve. The third solenoid valve briefly releases the pressure from the "header" so that the compressor isn't starting against a load. Once the compressor is running this third valve closes. My main point here is that, if I understand the system correctly, that the third solenoid (motor bleed off valve) is in parallel with the 2 solenoids controlling flow to the air bags. It does occur to me that I don't know where/how the system bleeds air from an air bag to lower a side after the load is removed from the vehicles. Any other thoughts?

I have a 2004 GMC Envoy Slt. The rear air suspension is not working. Compressor is running and attempting to fill, but nothing. Took it to be checked and the tech found nothing. He 'reset'? It and then it worked fine. Until the next day. It is doing the same thing. No codes popped up and no leaks were found. What could it be?

Suspension problem
2003 GMC Envoy V6 Four Wheel Drive Automatic 75000 miles

My 03 Envoy air compressor will not inflate the air suspension. The accessory outlet for the compressor is producing about 31psi. The rear end is sitting way down with a little bit of air in the shocks but will bottom out easily. I don't think it is a leak as this is the second time this has happened. The compressor comes on for about 30 sec to 1 min at startup but no increase in ride hight. The last time it happened I parked with one wheel on the curb, re-started the engine and when the compressor kicked in I raised and lowered the back end by lifting on the trailer hitch. This inflated the airbags for about 2 months. The most recent drop in the suspension coincided with a dead (bad) battery. The battery has been replaced. Is there an overload reset? As the symptoms mimic what the manual says the suspension will do in the event of an overload.

Hi, my 2003 Envoy has the exact same problem. Dealer informs me, the pump is shot. Did you find a solution for yours? Very curious what the root case was.

I just repaired one. The compressor has two parts: An electric circuit board with solenoids that route pressure to whichever side is low. Nothing goes wrong with any of the electronics or electric motor. And it has a trunk air compressor. Both are powered by a single teflon ringed piston spun by an electric motor. The part that goes bad is what's actually the connecting rod bearing. In this case it's a needle bearing. It disintergrates and particles of steel get trapped between the

Teflon rings in the aluminum cylinder. The whole assembly also goes off center with all the sloppy movement that interrupts the way the piston inhales. Mechanically, it keeps working because the motor still spins the piston, although very sloppy and destructive until the plastic rod shatters. So don't keep turning it on from the trunk, you may be able to save it. I actually repaired mine by buying a pack of two 9/16 plastic hole plugs at Lowe's for .99 cents. I drilled a 9/16 hole through where the spun bearing was and plugged it with the two plugs, one on each side. Then melted in a 6mm deep socket from one end, leaving the other end closed. (The 6mm deep socket with 1/4 in. drive is exactly 12mm) Pushed in two new needle bearings (6mm Inner Diam. and 12mm Outer Diam.) Loaded it with some grease and reassembled. *Some advice: Don't use the compressor from the trunk. This is a very expensive setup for the air suspension, so if you need air, go to the gas station or use another compressor at home.

I am trying to do the repair listed above but I don't understand the steps.

Did you completely disassemble the compressor? How did you get the electric motor disconnected from the pump body?

You also may want to check the sync of the inflation system, watched a guy at work sell the compressor and shocks to someone and it was just out of calibration.

I currently have the SUV in the dealership because the rear air ride suspension keeps dropping about 2 1/2 inches after the car sits for about 3 hours. The suspension drops evenly on both sides. Initially the service dept told me I needed to replace the air bags and the compressor, but the leak still occurs at the same rate after the items were replaced. They have checked for errors in the computer system, but nothing comes up. They tried re-setting the system, but that didn't work either. Now I am being told that a certain amount of droppage is expected, but I have had the car for 6 years and this is the first time this has happened.

Any ideas on what this might be?