Question about 1997 Cadillac DeVille

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Over heating when driving. changed thermostat, changed head gasket, still over heating and now it is hard to start

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  • tonyd4 Sep 08, 2009

    water pump has been changed and radiator is new, but system has not been flushed.

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It is hard to start because the recent overheat causing a gap between the head gasket reducing the compression ratio in each cylinder hence it is difficult for a combustion.
The most culprit of the car overheating is the poor circulation of coolant due to bad pump or/ and clog up radiator. The 2 important things that have not been mentioned are needed to take care of now.

Posted on Sep 07, 2009

  • Linh Thanh Sep 08, 2009

    Now I know you had a new radiator.

    Let's check if your new water pump is working properly.

    Take off your thermostate and run your car like that for a few days to see if it is still oveheated. You can squeeze the upper hose of your radiator to feel the water flowing inside or not. If it s weak then your have a bad water pump or water jacket get clogged up.

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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.

Important point....Do not run your car without a thermostat,.........strangely enough,this can cause overheating on this engine, as the Northstar cooling system is different to most conventional systems.....I can explain how this works if you wish but please understand that running your car without the stat will not help you to diagnose the problem.

Posted on Sep 10, 2009

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Could be water pump impeller spinning on shaft therefore not pumping water. Could be you need to flush the radiator, could be a coolant temp sensor, Do you have electric fans? if so do they come on when temp dets hot?

Posted on Sep 07, 2009

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