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: 120,146 (22,400–210,000)
Engines affected: 4.6L V8, 4.9L V8
12 model years affected: 1994, 1995, 1996, 1997, more1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
114 people reported this problem
59 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!!!!!
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!!!
2001 DTS overheated, had to pay $2.400.00 to replace the engine,,,, this should of been a RECALL.....
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!!!!
2001 Cadillac DeVille119,000
overheats 10 min after star up
don't know what to do?
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?
Kept overheating. Brought to the dealer. 4000 dollars later it was fixed.
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...
2005 Cadillac DeVille134,000
Car over heats in summer does not over heat in winter
2001 Cadillac DeVille- 4.6L V8180,000
1999 Cadillac DeVille107,019
Car overheats constantly. But before it was parked for 4 months it only overheated with no coolant in the oil.. Now that I've started it the other day it has coolant in the oil. Head gasket blew from sitting there or is it just it was on its way to go?
1999 Cadillac DeVille- 4.6L V8150,000
Mechanic says its might be a head gasket but is not for sure. Engine overheated, replaced termistat, water pump, and added coolant still overheating. Looking for a solution on how to repair the problem.
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 V8
Oil and water mixing
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