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Al and son

Heater fan wiring harness

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Been trying to get the heater fan to work on something other than high. Thought it was the switch, no biggie. Problem is the connector is melted in the center. Mack recommended changing the wiring harness. Problem is, it goes into the dash and goes around some gizmo and I can't find where it goes from there. How do I change this thing out without tearing the entire truck apart?  It's a 2004 Mack CX

 

 

Edited by Al and son

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The HVAC harness to cab connector is right above the throttle pedal. You can remove the drivers side cover and front cover on the HVAC unit fairly easy. That should give you enough room to replace and rout the harness. 

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You won't melt the connectors if you add a relay to the system.

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Did put a new resistor in. The old one was fried

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is this the same as a 1999 Mack CH with the older style dash? mine is fried too.

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