Heater Cores and Blower Fans
1982-1994 Chevy Cavaliers
1995-2005 Chevy Cavaliers

Why is a 1999 Chevy Cavalier still overheating after the water pump heater core and temp sensor have been changed and flushing the radiator?

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2009-01-05 15:20:52
2009-01-05 15:20:52

blowed head gasket or cracked head

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If it's overheating, it cold be thermostat, radiator or possibly other problems. If it's not overheating it could be the coolant level sensor.




Remove the Radiator and have it serviced if they are able to. If not you will need to replace it, would be a good time to replace the Radiator hose's as well. Hope This Helps.


Either the water pump impeller is loose on it's shaft, or you have a leaking head gasket.



Temp sensor not working, cooling fan not working, blown head gasket.


The most common cause of overheating is a thermostat stuck in the closed position. However, other causes are: faulty water pump, clogged radiator, clogged hose(s), coolant leak or a broken drive belt. I had a 1987 legend with around 160K that was overheating. Antifreeze would boil out of the overflow. I changed my radiator and it fixed the problem.



If your 1995 Oldsmobile Aurora keeps overheating and the issue is not the thermostat or the water pump, it could be the cooling fan. It might also be the radiator (leaking) or the hoses between the engine and radiator, or the shroud could be clogged or damaged.



Type your answer here... IF WE CHANGED ONLY COOLING FAN THEN IT WILL BE OVERHEAT BECAUSE WE DON'T CHANGE OR FLUSHING OF RADIATOR. WE CAN REMOVE THERMOSTAT VALVE ALSO MAY BE HOSE PIPE WILL BE BEND


A thermostat that is stuck in the closed position is a very common cause of overheating. A new thermostat should be installed every time the coolant is changed.


You didn't say anything about changing the thermostat....and when you changed the head gasket did you have the head checked for cracks....But first, be sure that the fan comes on and maybe back-flush the radiator. AND when you fill it with coolant be sure to get all the air out.


Radiator plugged or restricted? Cooling system airbound? Water pump not circulating coolant? Radiator cap defective? Radiator hoses collapsing under pressure? Defective gauge/cooling temperature sensor?


No an overheating engine will be due to leaking coolant, a faulty radiator, a faulty water pump, lack of oil or oil that needs to be changed


Check the grille on the front of the radiator and be sure that it is clean of all mud and debris otherwise the radiator is not able to pull air through to cool the water. You can clean that grille by removing the radiator from the truck and lightly pressure washing it.


The radiator could be plugged or a couple of the internal coolant passages in the engine block could be plugged. Try back-flushing the radiator and the engine and see if that helps.



the fan can be installed backwards and moving the air through the radiator in the wrong direction.The radiator or cooling ports can be plugged if a stop leak has been used on the engine.the water pump might not be working.


if it's like my V8 Porsche 914, i had air pockets in the cooling system at the water pump. when air is at the water pump there is nothing to push water. Therefore overheating. Other things to check is water pump and radiator.


You may have the thermostat in upside down, typically you want the pointed side facing UP.


It is very common for the impeller of a VW to break apart. The result is engine overheating and no heat. Usually, the the radiator remains full unless severe overheating causes a boilover and consequent loss of coolant. Also expect that the engine becomes hot yet radiator and heater hoses remain cool. If this happens, replace the water pump. It is usually convenient to replace the timing belt at this time.


my 2001 ford windstar is still overheating even though i changed out the thermostat. what could it be?




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