Question about 1999 Cadillac DeVille

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The car is running hot and we cant figure out what the problem is, we have changed the therm stat, water pump, radiator can you please help or is there so kind of cadillac manuel for the 99 car its a develle 4.6 north star.

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Turn the engine on, feel any water flow on either radiator hose, you can feel it, but abiously after it warms up thats when the thermostat opens, does it run rought at all??? lag of power, does it. check your fan clutch/electric fan. did you actually overheated the engine at all? the rason why is cause this engines have the habit of messing the headgaskets and over heat. that if worse gets to worse. let me know

Posted on Aug 01, 2010

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Posted on Jan 02, 2017

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Hi Lucas, Im AL the owner of Big As Auto Repair

Lucas, first thing to check for is make sure the cooling fans are coming on. Second thing to check and very common issue after replacing the water pump, is air trapped in the system. Make sure you get all the air out of the system. Some systems have an air bleed screw to help with this issue. If the fans are coming on and all the air is out of the system, then you'll want to check for coolant flow in the radiator. CAUSION: Let the engine cool before taking the cap off the radiator. After removing the radiator cap start the engine and let it idle, if the coolant does not flow after reaching operating temp, then you may have a restriction somewhere in the system. The other thing to check is make sure you put the thermostat in correctly, some vehicles you can install it backward, make sure the spring end is going toward the engine. If you have coolant flow and the coolant is blowing out of the radiator you may have a blown head gasket or timing issue. Hope this helps and please send people to my auto-repair-website at: http://www.bigasautorepair.com/

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