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My Dodge ram defrost gets warm then it gets off to cold cold
I have got a 98 Dodge ram 1500 360 engine and when I turn the defrost on it gets very warm and then it gets cold turns off cold I've done it back for us twice but new antifreeze in it put a new thermostat in it the water pump is good and on the driver side the heater core hose gets warm but on the pesticide the heater core hose is hot otherwise everything checks out what can it be any suggestions could it be the switch maybe burned out on defrost please help anybody
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