Question about 2000 Cadillac DeVille
Fans are working new thermostat will not hold water
Incorrectly routed, adjusted, tensioned, missing, or worn water pump belt(s).
Oil Pan Gasket - Performance
Ruptured, cracked or leaking radiator hose.
Worn or damaged radiator cap
Posted on Nov 17, 2008
Are you putting the thermostat in correctly? It it will not work backwards.
And to confirm that there isn't a different problem, take the thermostat out all together and see if it overheats.
Engine not fully warming up is not usually caused by the thermostat. Stats usually fail closed, not open.
You will want to check the water temperature sending unit or gauge after verify the water temperature with an external calibrated thermometer. You can attach and insulate the external thermometer to the housing where thermostat is located.
Reply back what you figure out. I will be happy to help you further.
Posted on Feb 03, 2009
SOURCE: Mercedes 300te, overheating
put alot of antifreeze on the radiator.this just happened to me last week and now it is fine
bet it cools a bit while driving NO? and than when you stop the gage goes up
Posted on Apr 21, 2009
you might have a blown head casket try due a pressure test on each cylinder and sometimes you can take a spark plug out 1 by 1 and just tap the ket so it cranks and see if water comes out of the cylinder
Posted on May 21, 2009
that leaves the radiator or the head gasket, do a compression test, look at the plugs for a whitish deposit, sure sign of coolant, good luck
Posted on May 28, 2010
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