Question about 1998 Ford Explorer

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My 2001 ford explorer with auto temp controls is only blowing cold air when the heater is on and temp set at 90. There is plenty of water in the system so i am not sure what it could be other than the heater core

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1suspect thermostat either primary for engine or secondary for heating system if fitted.
2 suspect that heat valve maybe jammed in the closed position so the mechanism can not open the flow to the cockpit.
3 suspect air in the system ensure the sytem is fully bled so the water can flow freely.

Posted on Nov 17, 2009

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