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If car still overheats after changing the thermostat the water pump the headgaskets and the radiator what else would cause it to overheat?

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2011-09-12 21:17:06
2011-09-12 21:17:06

If car still overheats after changing the thermostat the water pump the headgaskets and the radiator what else would cause it to overheat?

From what you describe it sounds like you might have an air lock in your cooling system. I would recommend that you bleed any and all air out of the cooling system. The bleeder valve is located on top of the engine. Once engine starts to overheat or when you can hear bubbling back into the overflow bottle, turn car off and open bleeder valve. If you see bubbling you have air in your system. Bleed the system a couple of times and see if this helps.

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if it still overheats after that like my BMW 318 does you could be looking at a crack in the engine as i think that's my next option

but also check or renew your heater matrix and temp sensors and use a rad leak in your rad even though its a new one as the leak could be in the engine so might seal it

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generally if an engine overheats, but then does not overheat when heater is turned on, is a good indication that the engine thermostat is stuck and needs replacing

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Assuming it did not overheat before you replaced thermostat and water pump you may have installed the thermostat backwards. It is also possible the cooling system wasn't refilled properly and was air bound.

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Generally, if your car overheats with the proper level of antifreeze, either your water pump has gone bad (not circulating fluid), the thermostat is stuck, or your radiator is clogged up inside. -NAPAman

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Mine was caused by a blown head gasket. Could be a defective thermostat or a plugged radiator too. Would need more detail about when it overheats and how you know it is overheating to give a better answer.

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There could be many reasons. Not enough coolant or bad flow, faulty thermostat, low oil. If the coolant freezes then it will overheat. If your car continues to overheat then you should have the coolant flushed and thermostat replaced.

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You may have the thermostat in backwards. The spring side of the thermostat faces into the engine.

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Either the thermostat was not the problem, or you put it in backwards.

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No beaxause it can overheat and catch fire No beaxause it can overheat and catch fire

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sounds to me like the thermostat has gone ... or possibly water pump failure (eg at 100K miles) or an oil problem. First check the coolant level. If it's at the proper level it is probably the thermostat It could be the thermostat, water pump, or even the radiator fan switch. If it only overheats when the car is driven at low speeds or in heavy traffic it might be the fan switch. If it overheats even when moving at a constant high rate of speed (over 45mph or so) then it is probably the water pump or thermostat.


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