Take it back to the garage who done the work and get them to check it over as it sounds like they have left a plug out somewhere on the power distribution box under the bonnet and if it was working when it went in then it should work when you get the car back ,be diplomatic and friendly and they do it free of charge and maybe even throw in a wax job,start shouting and you know what the answer will be also be a bit of a creeper and ask them if they could service the vehicle in a week or two when you get paid as this is the carrot in front of the donkey if you follow my drift
SOURCE: 1998 cadillac deville
try taking off your fuse panel cover, there should be a reset button in there.
SOURCE: MY 1998 CADILLAC DEVILLE REAR WONT RISE
arnott.com sells replacement shocks, take one of your orginal springs and go to a spring frabrication shop they should be able to fabricate a new spring for you with a 2 to 4 inch lift
SOURCE: Where are the cooling fan relays for a 1998
Are you sure that you don't mean the cooling fan control module? It should be located up front next to the cooling fan. It is square shaped and has a long square shaped plug going into it. 
Reads the temperature of the coolant and passes the information to the engine control computer (ECC). The ECC receives analog information and signals the cooling fan switch to cycle the cooling fan on or off, as required.
SOURCE: 2001 cadillac deville, overheats without loss of coolant
First, provided their are no visible coolant leaks and/or loss of coolant with no signs of leaks, I would thoroughly flush cooling system and replace coolant, then check and/or replace thermostat (you can place thermostat in boiling water to check for proper function), if you have tried these 2 steps and still are experiencing overheating you may need to replace your water pump which can be a tricky job if you're unfamiliar and try to do it yourself, however, I could walk you through it if necessary. Also visually check your radiator hoses for bulges, wear ,etc along with heater hoses etc. You may want to also check radiator fins to see if they are dirty/obstructed and clean if necessary. Let me know if I can assist you further and how it works out
SOURCE: 1998 Cadillac Deville low refrigerant a/c
I have a 1999 Cadillic Deville. The low Frefrigerant indicater come on after about 15 minutes of disconnecting the battery power. Each Time I reset the power the air conditioner comes back on for a while then goes out. I have taken it into the local auto repair place and they find no problem with the unit.
Could this be a intermittent connection to the computer. They have replaced both sencors and the problem persists. Where is the computer located on the car that handles this AC sensor message?
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