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Cadillac DeVille Engine Overheating May Cause Cylinder Head to Expand

 
Cadillac DeVille Problem
73 Reports
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Model Years Affected: 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005

Engines Affected: 4.6L V8, 4.9L V8

Average Mileage: 117,975 mi (58,000 mi - 203,000 mi)

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Overheating of the engine may cause the cylinder head to expand, severely straining the head bolts and damaging the threads in the engine block. This commonly results in a blown head gasket. Our technicians tell us the engine block threads must be repaired before the cylinder head is reinstalled.

  • Visitor, , 144,000 mi

    Engine constantly overheats...short and long trips. Replaced the thermostat and the overheating still continues, constantly feed it coolant. I had a diagnostic test performed and I am told that I have blown head gaskets, which can't be replaced without replacing the engine around 7K plus...I have found that the Northstar engine is the problem and GMC doesn't seem to care. The next time their company fails....please don't bail them out!!!!!

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  • Visitor, , 61,000 mi

    My CAD RUNS REALLY GOOD BUT LATELY IT HEATS UP NEW WATER PUMP WAS PUT IN. AND FLUSHED EVERYTHING AND NO BLOWN HEAD GASKET . YOU DRIVE IT FOR ABOUT 10 MILES AND THEN THE LIGHT COMES ON HOT IDILE CAR . ANY HELP ON WHAT TO LOOOK FOR NEXT . I REALLY LIKE THIS CAR. THANKS RAY

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  •  Rookie

    constant overheating and anti freeze consumption. shop checked it and said blown head gasket. 3000/5000$. BUT i added some blue devil head gasket sealer and i have put another 3000 miles on this car with no problems. runs great temp stays around 200. and to think i almost bought a new pickup because i thought this car was done for!!!

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  •  Rookie

    2001 DTS overheated, had to pay $2.400.00 to replace the engine,,,, this should of been a RECALL.....

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  • Visitor, , 67,000 mi

    don't know what to do?

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  • Visitor, , 77,000 mi

    over heating, pulled head bolts out. Poor design. Cost$$$$$$ to much!!!!

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  •  Rookie

    I had just bought this car, went on a test drive and did not overheat. After money changed hands driving the car home it run hot on me. Got the car home in my shop I noticed a pin hole in the overflow tank. Replaced the tank and the overheating persisted. I live in a mountainous area, and starting out the car would run for awhile, but when pulling uphill the temp would climb to 230 then 240, if it got any higher I WOULD PULL OVER,and let it cool. I also changed thermostats, upper and lower hoses, checked lines for blockages, made certain the fans run (which my friend the former owner had hot wired to run constant)Bu I removed the wires and the fans were in fact doing what they were supposed to do. Car was giving NO indication of head gasket issues. No coolant in oil, oil in coolant, no white smoke or coolant (sweet)smell out of exhaust. It was only when I started reading about the N* head bolt issues that I decided to take it to a guy that all he works on are these N* engines repairing overheating issues. I had the car shipped to him in Youngstown,OH and for 1500.00 he did the repair. Turned out it was the same issue all the N* overheating issues have turned out to be. The head bolts pulled from the threads on the back head of 3 cylinders causing a separation of the head gasket. He removed all the bolts from both heads and placed time-certs ( kind of like a helicoil of sorts). I am very satisfied with the work he did on my car and he also gave me a one year unlimited mileage warranty. Work was done in October, and I have driven 12,000 miles with no overheating issues. You can check out his web site at www.cadillacdoctor.com . I bought the car cheap (thought I was stealing it) but got what I paid for. With the work done, and having the car transported to Ohio, I have into the car about what it is worth, but love my Caddy so it is not for sale. And especially since the work is done right, I expect to have no other issues with my N* engine.

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  • same its bullsh@t

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  • Visitor, , 155,000 mi

    Leaking Anti-Freeze blown head gasket

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  • Visitor, , 160,000 mi

    My car started using constant oil and coolant then started overheating going uphill or fast. Now overheats whenever driven with coolant shooting onto inside of hood.Dealer said repairing head gasket would cost $3500.

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