Assuming that the a/c was in good shape before it suddenly stopped working, the problem is probably the blower motor. As it turns out, this is very common. Try searching answered questions under "blower motor 1997 Cadillac Deville" I just had to change mine in a 1996 Deville. Motor aprox. $240.00/Labor aprox. $100.
A 1997 Cadillac Deville does not have an air filter for the interior cabin. If the air seems to not be as cool or thicker than normal, the evaporator core might need to be cleaned.
there are no cabin filters in a 93 Cadillac deville
the top of the carborator
where is the idle control value on a 1995 cadillac sedan deville
To replace the air ride compressor on a 1999 Cadillac DeVille Concours remove the air shocks located under each wheel and replace it.
A person can reset the air ride suspension on a Cadillac Deville by disconnecting the compressor wiring harness from the compressor itself. This is accomplished by putting the vehicle on ramps.
The cabin air filter on a 1991 Cadillac DeVille is located under and slightly behind the glove compartment. All the air which enters the cabin is filtered through it to remove most contaminants.
passenger side temp acuator has gone bad
With that year deville...its more than likely the blower motor
A 1990 Cadillac Deville air conditioner should hold 46 oz. R12 Freon. This should be verified through the owners vehicle manual.
The 1991 Cadillac Deville oxygen sensors are located on the firewall and the air cleaner housing. The firewall oxygen sensor will be on the drivers side. The air cleaner oxygen sensor will be on the back of the air cleaner housing.