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I hve a 2002 deville that ive replaced the wsater pump thermostat n had radiotor checked did a pressure test no leaks and over heats when i put heat on what could it b somebody said i should splice the fans so one stays on at all times
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If your radiator fluid is lowering with this issue, check your oil dipstick. If it looks milky, you may have an issue with a leaking head gasket. It would be a good idea to have your regular mechanic do a pressure test on your cooling system.
I would change both first get a fail proof thermostat that way it would never over heat put it in and see if you got heat. if you got heat thermostat is good and water pump check your fans and make sure coolent is full make sure oil looks good you don't want to over heat that car or you will burn hea
Water pump, radiator doesn't have good flow. radiator is dirty on the outside. These are 3 possibilities The pumps impeller can become loose, it will give you enough water movement at idle, but under a load it starts to spin on the shaft. and the hotter it gets the more it will spin on the shaft.
check thermostat, put a coolant pressure tester to check for leaks. check radiator for fluid levels. check to see if electric fan is working. start car,when cooled, open radiator cap and check to see if its flowing,if not, then could be a bad water pump. check carpet under dash for wet spots to indicate if heater core is bad. any one of those could be at fault.
most likely heater core and to check if the water pump working..allow vehicle to warm up enough for thermostat to open and check for circulation in the fluid inside the radiator..if see it..water pump works.
Feel the 2 tubes at the firewall for the heater core. If they are not getting hot, the heater core needs to be flushed out or replaced. I had this problem with a 1990 Cadilac Deville, it was just a plugged up heater core.
Remember to install sealant after flushing out the system to prevent leaks.
Ihave a 2000 Dodge Durango i have put a new radiator and the gaskets came back good um i replaced the coolen fan also the thermostate and tested it it it came back good when i run it its fine but when i am in line its hot when i drive it cools down........
check for air bubbles in the system also check the pressure cap and have it tested also squeeze the upper radiator hose together and if it doesn't open up in your hand right away the water pump could be weak work on getting the air bubbles out first before going to the water pump
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