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Re: Heater fan plug melting
The fan will have three speeds. I suspect the wiring was either made or installed incorrect. This is what most likely caused the wiring to get too hot. As Mike C stated the low medium wiring is run through a resistor that is screwed into the plenum, behind the glove box on the bottom left. Wiring diagram will be needed. Unfortunately, the wires will need to be tracked one by one. I am assuming this is a non-AC truck. The wiring should be fairly simple and straight forward. Harness is available from vendors here on the board or manufactures like M&H. Also need to verify the proper function of the switch. Best Wishes, Bruce
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