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Here's an idea to get you started. Put the back end of the car up on ramps so you can crawl underneath it. With the front tires blocked securely, have a helper get into the car and roll down the windows so they can hear you talk from under the car. Have the parking brake set. Take a bucket or container of soapy water and a brush, and / or a spray bottle of soapy water, and crawl under to car. Have the helper start the car, and look and listen for leaks. I have heard the air bags leak on air ride cars after a few years. The soapy water should show a leak when applied to the air bags and the air lines.
Some of the Vehicles with Air Suspension require the Pump to be shut off , before you lift the Wheels, off the Ground. The hissing noise indicates the bags ruptured and need replaced, at the very least. If there is an air suspension Cut-off, it is usually right front Kick Panel Location. If not you made need to pull a Fuse. Without a Manual, you are kind of hosed. Buy a Manual , for around $30, at the Local Parts Store.
I had the same problem with my '02 Envoy 4x4; had the soap test done and there were no leaks; also had the air compressor motor checked and mechanics said it was fine. The rear air bags were worn and cracked so I had them replaced. It lifted and rode at the correct ride height for a few weeks.
After having the rear air bags replaced I noticed that it was starting to not lift as before. Had another diagnostic check; the air compressor was not forcing air through the system in order to lift the vehicle. The air compressor motor was replaced. Compressor comes on and shuts off now.
Vehicle is at the normal ride height now.
Rear air bags and air compressor motor were dealership parts; unable to find after market; not recommended to replace with used parts.
I had the dealership to run the diagnostics and had another mechanic to replace the parts. Total repair for bags, motor + labor = $1500
the most common problem in this truckr and the Ford expidition is that the rear suspension air springs are leaking, they last about 75,000 miles, less on really rough roads.
I have a 2001 Expedition, I don't have air bags in the front, the compressor don't work the air shocks. You have rear leveling. When they replaced the (compressor) did they turn the leveling switch back on. you may have air shocks connected to the compressor. Did the rear go down right after or over a couple of days. If the switch is on, turn it off and jack the rear up quiet a bit, make sure both side are quiet equal with each other, like it would be if it where raised by the air bags. Turn your level switch back on with it jacked up or sitting on stands. It may have went down so much that the compressor can't raise them back up.
You may have a leak in the rear air bags or the compressor for the air bags is not working,listen when you turn on the key to see if you can hear the compressor run ,if you do then likely the bags,if not then likely the compressor.
If your compressor is running all the time, it is almost certain that you have a leak. It could be either in the lines going to the rear air bags, or the air bags themselves. Simplest way to find a leak, is to get a spray bottle with soapy water, make sure the suspension is aired up, and spray the lines starting from the compressor. Work all the way back to the bags, now when you get the bags nice and soapy then bounce the rear of the truck up and down. If their are any leaks the soapy water will bubble up showing you wear the leak it.
That is how i would start.
If its a bigger leak the rear air bags wont stay aired up, if its a small leak, then the air compressor will be running all the time to keep the truck aired up.
Remember, when you are driving, the compressor is constantly working to keep the rear bags at the proper height, even more so on rough roads.
Hello;
The inflatrion air valves have probably gone bad. You can buy the valves seperate from the air bags but make sure your bags are in good shape. The air valves come (or did) with the new air bags. May be time to replace the rears with new. Hope this helps, please rate me high;
Rich
RPM northwest
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