Question about 1997 Ford F150 Regular Cab

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When temp selector is on hot.....blows cool and engine temp gauge reads cold and never moves off the first marker...not even after driving for an hour.....ideas???

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If the system is full of coolant, I would say the thermostat is stuck open.

Posted on Dec 05, 2012

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2003 chrysler town and coy try, temp gauge goes up and heater gets warm when idling, but as we drive the temp gauge goes way down and heater blows cool air. Any suggestions?


1. Engine Coolant Temperature.
If the thermostat in the cooling system is getting stuck in the open or partially open position rather than opening and closing as needed to keep the coolant at the required operating temperature then you will get the results you have described here with the coolant temp dropping as you drive. The radiator is providing optimum cooling when the car is moving and there is plenty of cold air flow through it.
I am assuming the temp gauge in the vehicle is reading correctly.

Thermostats in the cooling system do become faulty in time and it may well never have been changed (or only changed once) since the car was built and is possibly gummed up with debris. With those symptoms I would definitely change the thermostat. Make sure a full flush of the cooling system is done at the same time and refilled with fresh coolant.

2. In Car Heater.
I would not worry about the interior heating until you change the thermostat on the cooling system. However if you continue to get cold air from the heater then there will be an issue with hot coolant from the cooling system being restricted in flowing through the heater core.

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