Question about 1996 Cadillac DeVille
Ive changed water pump, and thermostat, and it still will overheat.
The car can be showing 240 degrees and i feel the air blowing off of the radiator, and it is not that hot at all.
Ive flushed the radiator, and the water comes out of all slots. So it is not clogged, and i do not lose any coolant at all. I do not have any leaks.
Ive read alot about northstar engines and head gasket, but this car has very good power and runs great. Just that it overheats overtime.
It just seems the radiator is not removing the heat from the engine.
Check for coolant flow at the Purge line,this is a common problem on the Northstar.
There is a small diameter hose coming from near the top of the coolant tank,this is the purge line.
With the engine idling,pull the purge line from the tank,if there is no coolant flow from this small hose,it is blocked and this will cause overheating.If the hose is clear, check for blockage at the nipple on the tank.
Posted on Aug 22, 2009
Check to make sure your exhaust or catalytic isn't clogged. Also thinner or synthetic oil will keep engine cooler. Are you filling up coolant system completely? Once it is filled the first time, you will have to burp the radiator hose and car should be running when filling. Let fill one full time, wait and burp hose, level will go down as fluid fills engine block, then you will need to refill system again. Check to see if you have a bleeding screw for your system as well
Posted on Aug 20, 2009
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