The water pump and/or the plastic side tanks on the radiator may leak causing a loss of coolant. The engine may overheat due to coolant loss. Continued coolant loss after external leaks have been repaired could indicate a blown head gasket.Google+
Car Problem Reports
Cadillac DeVille Coolant Leaks From Water Pump and Radiator
Cadillac DeVille Problem
Engines Affected: 4.6L V8, 4.9L V8
Average Mileage: 110,099 mi (13,241 mi - 188,723 mi)
Problems with leaking coolant.
Cost to fix: $750 to $1000. The problem? Northstar engine!
The engine is nothing but junk!!
Visitor, 1997 Cadillac DeVille, 188,723 mi
i replaced the radiator and water pump about a year ago.i recently replaced the resivour tank.car still runs hot at speeds over 65mph .temp is constantly up and down 196 to 245.i have to put antifreeze in at least once a day.
Visitor, 2003 Cadillac DeVille, 123,000 mi
The crossovers began leaking coolant. When this happens the coolant may mix with dirt from the engine or ground and appear to be oil. Heritage Cadillac robbed me of $1,500 by replacing the head gasket, knowing the crossover gasket was defective. Eventually, Heritage Cadillac replaced the crossover and water pump for another $1,500, only to say my electronic shocks were going bad. It's been a year later and my shocks are fine.
That Heritage Caddillac of JONESBORO, GA. Go to PEP BOYS, they won't cheat, lie, and overprice you.
Visitor, 1994 Cadillac DeVille, 4.6L V8, 135,000 mi
The radiator leaks at driver side bottom.Around a nut shaped plug.
Visitor, 2005 Cadillac DeVille, 75,000 mi
check cooling light cont to blink while driving
Radiator has been replaced once already at 70000 miles. The leaks persist but are not severe, yet. Average is perhaps 1/2 gallon per month/200 miles of travel.
Visitor, 1999 Cadillac DeVille, 89,000 mi
I am loosing coolant and I believe it is coming from the water pump.
I have not had any overheating problem yet.
Visitor, 1999 Cadillac DeVille, 115,000 mi
Visitor, 2004 Cadillac DeVille, 137,000 mi
2004 DTS has overheated since I bought it. Many coolant line leaks, replaced all the metal lines and some of the rubber too. Replaced water pump and removed thermostat. The more I do the worse it seems to get! Now going to remove radiator and have it cleaned and leak checked. Looks like someone used JB weld on lower passenger side of radiator? If this does not work, I dont know what else I could possibly do.
Visitor, 2001 Cadillac DeVille
I haven't gotten it fixed yet ,ot exactly sure whats going on