Question about Chevrolet Monte Carlo

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Over heating , replased hoses radiato , thermostat, water pump a year ago. oil looks good and good year service center cold not find problem.

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  • Jason Luskey
    Jason Luskey Mar 26, 2011

    What model of car or truck is it and what motor as well? auto or Manual?

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  • Chevrolet Master
  • 4,977 Answers

If you have replaced the radiator hoses.t-stat,water pump and no water in oil then you could have a cooling fan not operating(assuming it has an electric fan),or a bad head gasket or plugged radiator that is not allowing enough coolant flow.you need to check and make sure the cooling fan is operating if not then it will have to be fixed.pressure test the cooling system and check for leaks(external) and have the system checked for gases in the coolant with a head gasket test chemical.as far as the rad being plugged it will have to be removed and flow tested.

Posted on Mar 26, 2011

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I'd still check the thermostat. Or basically just replace it. Have you ever drained all the antifreeze and flushed the system? Good time to do both. If the hose's get real hot that doesn't really mean the thermostat open. Wouldn't they get hot even if the thermostat didnt open.? If the thermostat was stuck open you'd would have cold air and low temp gauge. Then maybe hit a pump or something and have the thermostat stick closed and have high temp. Maybe water pump. Check it when you have the belt off. Spin, pull & push the water pump pulley around. I'd replaced my water pump at about 110,000 on a '97 dodge Dakota. My 97 never had a very good heater. Always heated up more after driving. Idle never got it warmed up.

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I am not aying that this is what I think it is but I found this on your year BMW

Some BMW, Volkswagen and Audi cars have a common problem that the water pump impeller becomes dislodged from the input shaft of the water pump leaving the water pump looking ok from the outside, but failed on the inside. If your car experiences this problem it will over heat rapidly much like a thermostat failure. For exact specific repair procedures for this repair visit our online repair manual page.




Failed BMW, VW, Audi Water Pump Troubleshooting Procedure
  • Check Water Pump Operation - To troubleshoot this problem first drain about a half a gallon out of the cooling system, next remove the thermostat from the engine. With the thermostat out start the engine (stand back) coolant should be forced out of the thermostat port, if not the impeller has dislodged itself from the water pump input shaft and needs to be replaced. To replace the water pump finish draining the remainder of engine coolant, remove the serpentine belt and coolant hoses. Next remove the water pump mounting bolts and remove the water pump. Clean gasket surfaces and reinstall new water pump and reassemble. Refill with coolant and recheck system, top off engine coolant after it has re-cooled.

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