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Originally Posted by DFBonnett
Assuming the coolant level is OK, I'd suspect a defective thermostat. With the engine running, are both the upper and lower hoses hot? How about the hoses to the heater core?
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Except he stated it adds the coolant to the resevoir, but does not pull it back to the radiator. That's the sign of a clog!
When it did this to my car, there was a lot of air caught in the radiator, causing the overheat. My guess is there is also little or no coolant in the heater core, and that explains why the car has no heat as well.