Maybe low on refrigerant
I don't see why not. You'll probobly have to switch all the accessories for it too but The deville hasn't really changed very much since 1994 in fact in 94 it came with the option of the 4.9 and the 4.6 Northtar that comes standard in the 01.
you have a problem with theft system possible key cylinder
Buy a kit at Wal-Mart or auto parts comes with instructions
My 01 deville had a cracked intake boot, between the throttle body and intake manifold, it would only leak when eng was hot.
96 cadillac deville leaking on driver side bottom wondering what it could be from...... As long as it's not emptying, it's common that coolant comes out the over flow due to being over full
its time to get a new car. dont stay in the past
you still have a problem the light only comes on when it stores a current code
comes out inside . remove glovebox and go in that way . about one hour .
Your 2001 Cadillac DeVille's fuel pump is located inside of the fuel tank. to remove it you must remove the fuel tank from the bottom of the car. with the tank out, remove the locking ring the part that comes out is the fuel pump and level sensor. Cadillac Man
Redoing an AC system is trick business, the system must first be evacuated by a vacuum pump to remove all air before the refrigerant can go in and the pressure switch will not allow the compressor to come on or it will short cycle. Assuming you did it all properly try disconnecting the wire to the compressor and jumping it to 12 volts, that will activate the clutch. If it comes on and blows cold then the switch inside the car might be bad or some other electrical issue such as relay or fuse is the problem.
It can mean you have low oil pressure and it can mean that the oil sending unit is bad. Do not ignore this and have this checked out by a trusted mechanic.
Could be a bad wheel speed sensor.