Having problems with your 1998 Cadillac DeVille ?

I just bought a new radiator and thermostat and my cadillac is still overheating

Posted / edited by AnonymousUser on : 15-01-2018

Answers :

Check for exhaust in the cooling system. norstar has head bolt issues, allows head to leak combustion into cooloing system, pushing out coolant. Extremely expensive to fix CORRECTLY.
\012There are two other issues that also happen, and check these first: there is a small coolant hose 1/2 inch or so, that bleeds air from the block, it can plug, check it carefully,
\012Some water pumps have an impeller that fails, pretty quick overheat, though.
\012the head bolt issue is more mysterious, almost intermittant, but definately load related, when heat goes up, like going up a hill.
The northstar engine is very well known for blown head gaskets as the head bolts pull out of the block. To check with the cooling system full and the cap off with the engine running watch the coolant go by. If it never stopps bubbling or it bubbles as you rev the engine ( rev it slowly as to not blow the water out. If the coolant shows alot of bubbles then it has exhaust leaking into the coolant. Most cadillacs are supposaed to be run with a large quaintiy of stopleak added to the cooling system to keep this from happening. The problem is when they do get started leaking then the stop leak can't win and the engine has to be towarn down and or replaced. Many times the head bolts screw holes are striped and the engine can be thread repaired but the sucess of doing this and then rebilding the whole engine might gety into more money and time than you have aviaible.
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