1999 Cadillac Deville overheating/A/C problems

Tiny
LCIKA
  • MEMBER
  • 1999 CADILLAC DEVILLE
I have a 1999 Cadillac Deville with 125,000 miles that overheats when pulling mountains or sitting in traffic, we replaced the thermostat and that didn't help, we drove it the other day and it started overheating for the 3rd time on a 200 mile trip, when we opened the hood we saw the water pouring out the overflow,we used 12 gallons of water on this 200 mile trip to keep it filled, we see no leaks anywhere, head gasket we were told is not the problem, also our a/c blows cold on passenger side and drivers side and back seat air blows hot?????? we use dexcool in this and always use good gas and the right oil....


http://www.2carpros.com/forum/automotive_pictures/89416_weekend_003_1.jpg


http://www.2carpros.com/forum/automotive_pictures/89416_weekend_005_1.jpg

we are just puzzled by all this and need help in what to look for, any help would be appreciated, thanks
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Monday, July 30th, 2007 AT 9:17 AM

2 Replies

Tiny
CLOWNY5706
  • MEMBER
Check the head bolt threads. The threads on the block have been known to strech causing it to overheat. You have to drill, rethread and heli-coil it to repair. Check out timesert. Com under general motor kits to watch a video on the repair. I've seen a lot of N* engines that have had the same problem
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Sunday, September 23rd, 2007 AT 2:52 PM
Tiny
BUZZSAW
  • MEMBER
For one thing dexcoolant is for 2000 and above, and he is right on the threads comming out of block, if its not leaking and fans run properly you have a headgasket prob.
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Tuesday, September 25th, 2007 AT 12:33 AM

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