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Given only the information provided; if the cooling system is full of coolant, lt sounds as if the thermostat is stuck in the closed position and is not opening to allow the coolant to flow into the radiator. When you run the heater in the passenger cabin, it is acting as a mini-radiator and removing the heat from the the coolant. Check/replace the thermostat.

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Q: Honda CRV 2000 will run heat. After you turn the heater on the temp goes back down?
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