Having problems with your 1999 Cadillac DeVille ?

99 sts overheating

\015 I bought this 99 STS cadillac nice lookin car... had car for about two months no problem until my wife drove the car and it began to run hot, about 2 3/4 past the half way mark on gage...she immediately pulled car over waited about an hour until engine was cool...got home no problem....problem seems to be progresivly getting worse sence then. Car runs hot but no leaks that i can see....but coolent is pushing up thru fill hole...no smoke from tailpipe, no cloudy oil, no leaking from water pump, no leaking from radiator, car runs and drives fine. If anyone has a clue...holler back THANKS.\015 Posted / edited by AnonymousUser on : 15-07-2019

Answers :

Its possible your thermostat is stuck in either the on or off position. Also its not an expensive part. I would start there first and go from there. Also how many miles are on the vehicle. Also I assume this is a north star engine.
Twoguns2007 - I am having EXACTLY the same problem!!! I would appreciate you emailing me when you find the solution: [email protected]. I started with thermostat - path and cost of least resistance; did not remedy. Several mechanics leaned toward water pump; two others said head gaskets (extremely spendy, as you have probably found). The thing is, MINE does not run above hot/normal, for HUNDREDS of miles, but DOES use coolant. I like the Solution #1 guy's suggestion here as something to try BEFORE head gaskets. My Caddy only has 85,000 miles...just hard to believe it is a head gasket problem (or, rather, don't WANT to believe it). Please let me know what you find out; I will GREATLY appreciate it. Thanks, and best of luck to you.
Repair Help & Product Troubleshooting for 1999 Cadillac DeVille

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