Engine Overheating Due to Leaking Headgasket on Cadillac DeVille

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.

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Average mileage: 139,428 (22,400–1,600,000)
Engines affected: 4.6L V8, 4.9L V8
12 model years affected: 1994, 1995, 1996, 1997, more1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
109 people reported this problem
55 people shared problem details
1999 Cadillac DeVille144,000
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!!!!!
2001 DTS overheated, had to pay $2.400.00 to replace the engine,,,, this should of been a RECALL.....
constant overheating and anti freeze consumption. shop checked it and said blown head gasket. 3000/5000$. 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!!!
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.
over heating, pulled head bolts out. Poor design. Cost$$$$$$ to much!!!!
don't know what to do?
2001 Cadillac DeVille119,000
overheats 10 min after star up
Kept overheating. Brought to the dealer. 4000 dollars later it was fixed.
not fixed overheated through overflow tank twice on the same day wtf??? everyone knows there is a design problem witgh these engines why cant the company recall and repair? they have lost me as a customer don't they care? ford here I come f%(#!%$ you cadillac
Car kept over heating on highway due to low coolant levels. Took it into repair shop many times. changed water pump, clamps and still had same problem. Took car to a different repair shop that ran engine diagnostics and they gave me the bad news that now there is too much internal damage to the engine to repair. Sadly the car is in mint condition. Uncertain if there is anything to do or just junk the car?
Just bought a gorgeous 2001 Cadillac DeVille with only 64,000 miles this past December and after one month in moderate weather and basic traffic patterns the thing started overheating and I am told it is indeed a head gasket...nobody wants to touch it because of the design problems with the block/bolts...
2002 Cadillac DeVille117,000
Engine overheated and smoked due to antifreeze leaking through bad head gaskets. There is a kit available for about $2300 that reinforces the head bolt shafts. Got a used engine with about 50,000 miles on it installed for $2500
2004 Cadillac DeVille- 4.6L V882,714
bought the car used in 2015 it was really clean/perfect low miles I noticed that aggressive extended driving on the hwy the temp would creep up to the 1 o clock position. Never around town. Just on the hwy. I took it to the cadillac dealer they said blown headgasket it was a $5700 repair. I paid $6900 for the car
1995 Cadillac DeVille- 4.6L V81,600,000
Oil and water mixing
1999 Cadillac DeVille- 4.6L V8153,900
2nd time around replacing motor
Car temp. Would slight increase only during aggressive highway driving. Took to Cad dealer. Diagnosed head gaskets =$5500
2000 Cadillac DeVille160,000
Overheating. Can't figure it out. Replaced coolant reservoir and thermostat.Hopefully it's not head gaskets.
Car start to overheat at 62000 miles.Window regulator went out on me too.
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