My 98 cadillac rear air suspension will not left the car ?

Rear Compartment Relay Center
In the left rear of the passenger compartment, behind the rear seat, on the electronics bay
Rear Compartment Fuse Block
In the left front of the rear compartment, on the electronics bay

Under the left rear of the vehicle, on the rear suspension support

It will run about the same, there is a good web site we deal with that sells conversion kits or the air components needed to repair your car, we use them all the time. There pricing is good and also have all parts needed.
Your car may just need air bags, but have run into many cars that the air bags had been leaking for a while and were left not repaired causing the air compressor to run so much that it overheated and cooked the compressor and relay.This is hard to say on yours without looking at it. if the air shocks air leaking then you will need to start with that and then if the car does not lift then you will need to check the fuse and relay, if there are good or replaced and still no air is made then compressor will need replacing.
http://www.arnottindustries.com/part_CADILLAC_Air_Suspension_Parts_yid6_pid35.htmlthe compressor is 175.00 and the two shocks are 275.00.
I did not see a conversion kit for this car. take a look at site and see if you can locate one. good day.

I had a problem with my '98 Deville. I had a lot of issues with the air shocks and all the other electronic stuff that goes with that. I called the dealer, and they wanted $3500 to fix it!!! I found www.Strutmasters.com and they converted my car to a "passive" suspension, which bypassed that whole computer thing. Now I have a lifetime warranty, and I am VERY satisfied with the ride. The best part is that it only cost $800 and I got all new suspension! I highly recommend them for your vehicle!

your rear air suspension bags are leaking, u will need to have them replaced, this job requires a service factory manal and tha proper safety procedures be followed, so it is best left to an expert.

I have seen this before. They put car on lift which lets suspension drop. When they set it back down the Air ride leveling rods get stuck and think they need to stay full. Like what was already mentioned, check your levelers located next to your suspension air bags to see if they are stuck.

Common problem on all air suspension vehicles. It could be that there is a hairline crack in one of the shock bladders or that the pump is just too weak to pump up to it's intended pressure, a sensor or solenoid could also be bad.

Whenever I run into this problem I order a spring conversion kit for that vehicle, it is usually not worth spending $3000+ to repair the suspension.

www.Strutmasters.com sells the best kits, $327.00 for the rear. It also comes with a resistor so that your suspension light is not on.

I have a 1998 Deville and both rear coil springs are broken.. It also has the air shocks that I dont think work.. Can I put regular shocks in and is there a after market coil spring out there for it ??

You may have either leaking shocks. follow the air line from the shock to the compressor.

Converting from the air ride suspension to the passive coil spring suspension will eliminate this problem. To fix your air system you will have to purchase the parts directly from the dealer which means the prices will be severely inflated. Check out Strutmasters website at: http://www.strutmasters.com/Cadillac-Eldorado-Air-Suspension-Rear-Conversion-R-p/-cad-r5ns-el.htm My Uncle converted his Cadillac Deville two years and has only had positive things to say about the effects! I hope this advice was of some help.