Question about 2000 Cadillac DeVille

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Overheating after changing the head gasket

Is there any possible way that after changing the head gaskets the engine will overheat?

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Could have a cracked blocked as well

Posted on Feb 16, 2009

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Yes, due to many things.

No ....1 Did you replace the thermostat ?

Take out the thermostat, and pop it in a saucepan covered in water, bring to the boil, and see if it opens, this will confirm if this is the fault.

If not..............

1. The cooling system must be topped up, and pressure tested to max running pressure 15lb sq in.

If there is an external leak this will show it up, possibly from cooling or heater hose, water pump, radiator, or the heater matrix.

If nothing is apparent an internal leak, must be then suspected, ie head/s or head/s gaket/s.

2. To test out this , a carbon monoxide test, should be carried out on the cooling system, by passing, a sample of the cooling system gas, when engine is at normal running temperature ,through the test fluid in the vacuum tester.
If the fluid changes color, this is proof the combustion chamber gases are escaping into the cooling system, which over pressurizes the system and normally blows the coolant out of the header tank overflow, as you drive along, and you do not see.
The other symptom of this problem, is the coolant leaks back into the combustion chambers, when the engine is switched off, and when you start later, a misfire is noticeable until the spark plug dries out.
Also if the plugs are removed, and after 1hr of cooling system pressurizing, the engine is spun, any coolant from the plug holes will confirm head, or head gasket failure.

I hope it is the thermostat....?
Let me have your thoughts !
Good Luck !

A FixYa rating is all I require...Thanks...John.

Posted on Feb 16, 2009


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I used to drive a 96 caddy and i could never figure
out why it would always overheat on my way to school and on my way home and then one day i figured out that it was the water pump so i changed it and it fixed the over heating problem but there is something alittle strange out this when water pump gos out it will normally leak coolent everywhere my caddy never did that
so anyraight ya i would highly recomend getting that checked out

Posted on Feb 16, 2009

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Yes ! Why were headgaskets done in first place, obviously over heating problems. Were the heads checked for cracks, or replaced? The entire cooling system should have been checked to begin with, and hopefully when re-assembled, it was done properly, as well as bleeding procedure performed correctly on the cooling system. How about filling us in from the start?

Posted on Feb 16, 2009

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