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Also, It doesn't matter if it is on defrost, heat, vent or whatever. It never overheats until you turn the thermostat control to hot. Then the gauge goes up. You turn it back to cold and it goes back down. I checked the heater core and thermostat. Any ideas? Thats a strange one. Heater settings should not make a difference in the operating temperature of the engine unless some kind of electrical malfunction is preventing the radiator cooling fan from coming on when the temp is set to hot. Check to see that the fan is running when the heat is on and maybe you will have a place to start troubleshooting the problem.

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18y ago

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