Most catastrophic may be a Head gasket leak. Check coolant tank for bubbles with the cap off and engine running. Otherwise, last time serviced? Did you check oil? There is a trouble code system, but need a service manual to read the code.
service manual may be here: http://www.filepeep.com/
Or. http://www.manualslib.com/
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SOURCE: service engine soon light came on and stays on
The warranty company was able to find a used transmission for $900 which was still under warranty and it will cost 11.5 hours for the install, plus shop supplies and diagnostic. Total cost about $2000. I drove the car for probably at least 10,000 miles and it was leaking a small amount of transmission fluid even after I fixed a seal (waste of money) before getting it fixed. I didn't see the fluid though on my garage floor though as there is something that would catch it.
Cadillac dealer stated this is a known problem with the clutch assembly and that there is a bulletin out on it. The reason the car stalls is due to the transmission not the engine. When the car is at a light or the like there is apparently too much strain from the tranny and it stalls the engine. My car didn't get that far, but after reading a bunch of stuff and looking up the codes it appears to be the case. Of course you could get lucky and the solenoid is just bad, probably not though due to the bulletin.
You can read the codes and clear the codes easy enough. If you don't know how there are many posts on the net.
SOURCE: 1994 cadillac deville concours
On my car, which is the same as yours, it is located on the manifold top back left. Pictures in the book just show it on top.
SOURCE: 1998 Cadillac Deville overheating
The most common overheating problem with the Northstar engine is a blocked purge line. It's job is to purge air out of the cooling system.
There is a small diameter hose coming from near the top of the coolant tank,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.Or trace the hose back until you find the blockage.The hose goes in to the engine to a crossover and comes out the other side to near the thermostat housing,the blockage may be there.
SOURCE: My 2003 cadillac deville-the service engine soon
On a lot of cars the light is reset when you get an oil change, air filter etc. It's overdue for a "look see". You can always go to advance auto and borrow the code reader for free. Plug it in under your dash and will read and reset any codes
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