Where is the air compressor forthe rear shocks on a 1993 deville located?

The pump is back under the rear of car, but by now, the shocks are sure to be leaking, which causes the pump to run too much burning it up. Best fix is to replace rear shocks with coils and dump the self leveling feature, or prepare to pay big bucks to replace most components.

Would need to know what DTC'S - diagnostic trouble codes are stored in the module for the autoride suspension . Hooking up a professional type scan tool ,looking at input data to the module etc... Looking at a wiring diagram an testing electrical circuit's using a DMM - digital multi-meter . Reading how the system works ,what all involved in making the system work . This is how a professional Tech would go about diagnosing this .

The automatic level control (ALC) system maintains a desired rear suspension position under all types of towing, hauling and loading conditions. The following components are involved in the operation of the ALC system:
• Air line tubing--Pressurized air from the ALC compressor is pumped to each of the rear shocks via air line tubing.
• Air drier--Pressurized air from the compressor is run through a drier containing a moisture absorbing chemical preventing water accumulation in the rear shocks.
• Compressor--Supplies pressurized air to the rear shocks
• Compressor motor relay--The relay supplies battery positive voltage to the ALC compressor motor.
• Pressure sensor--The electronic suspension control module (ESCM) module provides a 5-volt reference and low reference to the ALC pressure sensor. The module receives the signal voltage that is relative to the air pressure applied to the rear shocks.
• ESCM--Controls the ALC system and electronic suspension control (ESC) system and detects failures in both. The module monitors inputs from the position sensors, and pressure sensor to determine when to raise and lower the vehicle to trim height as the vehicle is loaded or unloaded. The module limits pump activation to 255 seconds to prevent thermal damage.
• Exhaust valve--An electric solenoid activated by the ESCM to vent air pressure from the rear shocks.
• Left and right rear suspension position sensors--The module provides a 5-volt reference and low reference to all 4 of the body-to-wheel suspension position sensors. The sensors send the ESCM a signal voltage that is relative to the rear suspension ride height
• Left and right rear shock absorbers with internal air chambers and dampers--Dampens the rear suspension and maintains trim height depending on the air pressure applied.

Did you check the fuse? Not only check the fuse, check voltage on fuse circuit , goes hot with key on. The bottom info should be for relay center location.

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.

The compressor will turn on when the rear air shocks are low. These shocks will begin to leak with age, and if new, can be damaged if you raise the rear end without disconnecting the battery. The shocks will fill with too much air and create a leak. If your motor runs continuously, you may need to replace the shocks. May also have a leak in the air hose going to the compressor. Check the fitting. Short fix would be to disconnect the power going to the compressor, but your ride will suffer.

The 97 Caddie Seville STS has an air compressor located under the car just in front of the passenger side muffler, above the crossmember. It is a pretty weak compressor, and is only designed to slowly fill up the shocks. Probable issues are a blown compressor, or leaky shocks. Before replacing either make sure you have power going to the compressor, and air going to the shocks. No power to the compressor could be caused by a bad wire, relay, connector or fuse all of which are cheaper to fix. If you have power, check the little air lines leading to the shocks from the compressor to see if you have a leak. Airlines are much cheaper than shocks.

Check in this order: Is the compressor starting when you turn the car on? If not: is the fuse burnt, broken wires? If not: Is the linkage that connects the frame to the left rear shock broken or seized? (more wires to check here). If the compressor runs and the linkage is functional, spray some windex (or soapy solution) on the rubbers of the rear shocks and around the hoses to see if air is bubbling out. If so, this is where the problem is. Many aftermarket shocks/struts are available (check ebay) online for as little as $ 150.00 each, and $ 175.00 for the compressor.

Yes you can, But even better yet would be a set of air shocks on there. I had a 92 Grand Marquis that blew out the rear suspension, and I put reg shocks on there, worked great, looked normal, No problem. They wanted $2,000 to fix mine. I said later. But the air shocks, if you have a full load or a sagging problem, you can just get out the compressor and blow them up. Hope this helps.

auto level fuse box is located at rear of car under near suspension carrier, all fuses and relays to do with level ride are there, good luck.

by pass the air compressor unit with a universal air shock kit from auto zone. 18 bucks a couple of fittings and fill it up manually