There are many components to an air suspension system and it can be very costly trying to find the problem. When I bought my first car it was a 1990 Cadillac Deville. The thing kept sagging in the rear, over and over. After buying replacement air parts that seamed to keep failing, I bought a conversion kit from Strutmasters. I saved money and time. With all the air parts that could be causing your compressor to not be working, I would say call Strutmasters.
The compressor is between the right hand wheel and headlight (right hand drive) in wheel arch
the compressor is located under windshield washer tank and airfilter box both need to be removed. then unplug wire at compressor, there are three nuts 10mm holding the compressor in you get at them from under car.
The compressor is located in a compartment in the left front wheel hub. To access it you have to remove the air cleaner and the washer fluid reservior.
with a new compressor is a good place to look and see if it's working then see if the fan to blow it is still working you fix it with a new ac compressor pulley and recharge the freon in the car
firing order for a 1991 cadillac deville
remove air filter then unscrew it and it is right underneath that you might have to take the window washer fluid container off too
you prob have a hol some ware or your compresser is damaged you prob have a hol some ware or your compresser is damaged
what does elrs means in de cadillac deville 1991
I have a 1991 cadillac brougham the car is a Hearse the vin#1G6DW54E3MR722246
On my 1991 Town Car I had the air suspension compressor replaced, it was located below the air filter in the drivers side fender well. You also have to remove the wishield washer fluid tank and a small plastic shield.
its on the drivers side under the hood mounted to the top of left wheel well you will see a round filter that has air lines on top, this is mounted to air compressor it keeps the moisture out of air system
full filter locatoin on a 1991 Cadillac Seville