You need to check a few things. Do you ever hear the air compressor at the rear of the vehicle running?
If so, does it run continuously with the ignition on? (that will mean there is usually an air leak either in one of the rear shocks or the air lines/connectors).
If not, either the compressor, or the compressor relay, level switch and/or the fuse may be shot and each will have to be checked.
SOURCE: rear air shocks 2003 Buick LeSabre
I'd have them checked first to determine if it is actually the shocks, or possibly just a loose or cracked line, which should be a pretty inexpensive fix. If it turns out to be shocks, weigh it out then.
SOURCE: 2004 yukon xl denali self-leveling rear air shocks
There's a lever that connects the driver-side rear shock to the Automatic Level Control module (the air compressor and the ride-height sensor). Disconnect the lever from the shock and rotate it up and hold it. The compressor should kick in when you hold in place after a few seconds. If it doesn't kick in, make sure your fuses and relays are good. Otherwise, you may have a failed ALC module/burned out air compressor (from the shocks being shot). After you replace the shocks (and after you recouped from the heart attack you had when you shelled out $500+ for each shock), replace the ALC module/compressor (it's all one unit), and test it - it should kick on when you rotate the lever up again.
Figure about $350 for the ALC module from your dealer, and make sure the part numbers match! Your truck came with an upgraded ALC module from the 2001-2004 module, which were prone to water damage.
Good luck!
SOURCE: Replace Rear Shock Air Compressor
i am not really sure but for the most part its under the hood just inside one of the fenders but i would like to give you this number they only sells GM- parts its Schram auto & truck parts # 1-800-292-1032
SOURCE: 2000 buick LeSabre - rear leveling system problems
The rear leveling trip switch is located on driver's side near rear air shock on the frame. Check for leaks in air line.
SOURCE: My right rear suspension is flat on my 2000 Buick
Hello. A couple things may have happened.1, one of the rear air shocks could have blown out, or 2, you may have a air line leaking or broke. We are here to help you get your vehicle diag and repaired. Craig
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