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93 TOPAZ I Changed thermostat black wire box radiator half hotter then other half still overheats what should you check next?


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Wiki User
2007-03-22 00:57:48
2007-03-22 00:57:48

I would be thinking it is a head gasket.

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No. The thermostat controls the flow of water through the radiator, not the heating core. Using a thermostat with a higher temperature rating delay the opening of the thermostat (and the flow of water to the radiator) until that higher temperature is reached. This will cause the coolant to run hotter.

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One way to easily tell is to check the bottom radiator hose, if the hose is extremely hotter than the top hose, the thermostat is not opening fully or stuck in the closed position.

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Yes, that is because the radiator is cooling it, the running temp should be about 195 or so when the thermostat opens to let the hotter coolant in to the radiator to be cooled.

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The coolant could have frozen in the radiator. If that happens the coolant in the engine will just get hotter. It could also be the thermostat.

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hotter water turn up the heat using the thermostat on it


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