MY 1998 CADILLAC DEVILLE REAR WON'T RISE ALL THAT SHOULD AND THE CAR RIDES A LITTLE HARD .IS THE REAR SUSPENSION GONE BAD AND IF IT IS WHAT CAN I USE AS A INTERCHANGABLE SHOCK OR AND SPRING THAT I CAN USE.
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My girlfriends 2000 DHS had the same problem. She leaves her car beneith the carport because she don't have a garage. When tempertures are in the low 20s and High teens the car rode like a log wagon. When the tempertures rise during the day up into the high 30s all was well. No alarm on dash so dealer said not to bring it in because code would be found and a waste of money. I found the problem by heating up the rear shock with a torch and the car rode smooth. Removed the shock and found water and when compressed the water gushed out. Got replacement shocks online from low mileage deville for $120 pair. Replaced dryer so moisture would not ruin replaced shocks. New shocks was $800. That is what your problem is my friend. Your dryer is not doing the job in keeping moisture out of your system. Paid online $35.00 for dryer.
Yes there is a air compressor follow the plastic tubes from the shocks to locate it also make sure your leveling sensor on your rear axle is not damaged if it is ok then you will have to have the system diagnoised to find out what is wrong.If it is just a air leak it should be rather simple to repair with pieces from your local parts store.