I replaced the waterpump on my 2005 impala, but the overheating light keeps coming on, but there are no signs of overheating under the hood, what can I do to fix this?
Check to see if there is water in the oil...If there is water in the oil then it could have a head gasket problem..Did you ever replace the thermostat? If it is stuck then it would also cause overheating...Excessive exhaust backpressure because of a clogged catalytic converter could also cause overheating..Also check belt tension and condition. A loose belt that slips may prevent the water pump from circulating coolant fast enough and/or the fan from turning fast for proper cooling...Another thing it could be is a faulty Water pump -- Any wobble in the pump shaft or seepage would call for replacement. In some instances, a pump can cause an engine to overheat if the impeller vanes are badly eroded due to corrosion or if the impeller has come loose from the shaft. The wrong pump may also cause an engine to overheat. Some engines with serpentine drive belts require a special water pump that turns in the opposite direction of those used on the same engine with ordinary V-belts... Also check the Fan -- With mechanical fans, most overheating problems are caused by a faulty fan clutch, though a missing fan shroud can reduce the fan's cooling effectiveness by as much as 50% (depending on the fan's distance from the radiator) which may be enough to cause the engine to overheat in hot weather or when working hard.
Dennb...
Be sure that you bleed the system of air after you change the water pump. there are two places on top of the motor...one on each side in the front. If you do not do this then the car will overheat and blow cold air. For more info on this call Auto Zone. They can be a great help.
I have a 2005 Chevy Impala 3.4L. And the cooling system for this car is terrible. However, I will tell you. If you replace the radiator and thermostat right off. You will save yourself alot of trouble. My mechanic replaced bot for 400.00 and the car has given little trouble until now. But the cooling system if ignored "will" crack the heads and head gaskets on this model.
Take it seriously from the begining. Please let me know if you need more details.
Change t stat
Hi,
Did you replace the thermostat? It's inexpensive and easy enough to do. Sometimes they stick and don't allow enough coolant to circulate through the engine.
This would be my first action. Hope this helps you... Good luck!
Hi,
I much prefer actual temp. guages over lights...
You could have someone do an actual thermal check to see if it's truly "hot" or if the temp sensor is faulty.
Assuming the sensor is not faulty, if your coolant level is ok with engine cold, doesn't leak anywhere when first running, I would suspect and replace the thermostat.
I think being your car is a later model, your radiator shouldn't normally be a suspect.
The thermostat is inexpensive and easy enough to replace.
I hope this helps... Good luck!
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Did you also replace the thermostat at the same time. It may not be opening. Do you get heat blowing from the heater when it is turned on? The thermostat should always be replaced when doing any repairs on the cooling system. They are very cheap and can prevent many problems.
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