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Heater Stops Pumping Heat: Thermostat Possible Cause?

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beaujay...If your temperature gauge is indicating a lower temp than thermostat temperature, you likely have a defective thermostat.  If the engine is at normal temperature and the heater core is not getting warm, this can be a clogged hose or a closed heater control valve.  If the heater core and engine are both at normal temp and you're still freezing with the heater on, you have a heater control or heater vent door problem.


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