Coolant Leaks From Water Pump and Radiator on Cadillac DeVille

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.

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Average mileage: 108,050 (12,000–188,723)
Engines affected: 4.6L V8, 4.9L V8
12 model years affected: 1994, 1995, 1996, 1997, more1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
64 people reported this problem
27 people shared problem details
1997 Cadillac DeVille188,723
i replaced the radiator and water pump about a year ago.i recently replaced the resivour 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.
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2003 Cadillac DeVille123,000
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.
1994 Cadillac DeVille- 4.6L V8135,000
The radiator leaks at driver side bottom.Around a nut shaped plug.
check cooling light cont to blink while driving
I am loosing coolant and I believe it is coming from the water pump. I have not had any overheating problem yet.
Problems with leaking coolant. Cost to fix: $750 to $1000. The problem? Northstar engine! The engine is nothing but junk!!
Losing antifreeze and finally replaced the water pump, thermostat, belt.
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.
1999 Cadillac DeVille115,000
Coolant overheating
I bought the car and drove home (about 15 miles) and all the water leaked out and the car overheated (265 deg.) I parked it and have not driven it since. I need to buy a new radiator at a cost of $180 minimum.
2003 Cadillac DeVille- 4.6L V8126,725
My car was parked and all my antifreeze leaked out
2000 Cadillac DeVille- 4.6L V8
Over heating
2000 Cadillac DeVille- 4.6L V8130,000
Coolant leak
coolant leaks. haven't found the problem yet.
a slow leak of coolant was coming from the water pump. water pump was removed and replaced to solve problem.
runs for awhile then overheats
water pump had to be replaced 500.00 bucks
Coolant started leaking and then spraying onto inside of hood. Then car stared overheating and can't hold coolant. Now head gaskets are said to be bad.
2004 Cadillac DeVille137,000
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.
I haven't gotten it fixed yet ,ot exactly sure whats going on
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