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2007 Ford Ranger Question: I replaced the heat switch the heater still put out hot air constant

 

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5th st. kid, Parker, CO, July 10, 2014, 13:44
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I purchased the vehicle with the heater putting out hot air even when the knob was put on the coldest setting. I replaced the switch but it still continues and turning the knob to hotter makes no difference. I noticed two wiring harnesses in the engine compartment attached to the heater near the bottom of the heater are these sensors which control the vents?

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