Since the heater is removing heat from the coolant, it suggests there isn't enough cooling taking place in the radiator. Two common causes are the radiator fan is not turning on if it is electric or the clutch is defective if it is belt-driven, or the fins of the radiator are rotted away. If the fan is the problem, the engine will run cooler at highway speeds. If the cooling fins are the problem, the engine will tend to run hotter at highway speeds or when under load.
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Thursday, April 1st, 2010 AT 6:58 AM