Al and son Posted February 12, 2018 Share Posted February 12, 2018 (edited) 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 February 12, 2018 by Al and son Quote Link to comment https://www.bigmacktrucks.com/topic/52491-heater-fan-wiring-harness/ Share on other sites More sharing options...
turckster Posted February 17, 2018 Share Posted February 17, 2018 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. Quote Link to comment https://www.bigmacktrucks.com/topic/52491-heater-fan-wiring-harness/#findComment-392235 Share on other sites More sharing options...
41chevy Posted February 17, 2018 Share Posted February 17, 2018 You won't melt the connectors if you add a relay to the system. Quote "OPERTUNITY IS MISSED BY MOST PEOPLE BECAUSE IT IS DRESSED IN OVERALLS AND LOOKS LIKE WORK" Thomas Edison “Life’s journey is not to arrive at the grave safely, in a well preserved body, but rather to skid in sideways, totally worn out, shouting ‘Holy shit, what a ride!’” P.T.CHESHIRE Link to comment https://www.bigmacktrucks.com/topic/52491-heater-fan-wiring-harness/#findComment-392242 Share on other sites More sharing options...
Al and son Posted March 2, 2018 Author Share Posted March 2, 2018 Did put a new resistor in. The old one was fried Quote Link to comment https://www.bigmacktrucks.com/topic/52491-heater-fan-wiring-harness/#findComment-393254 Share on other sites More sharing options...
Keffer inc Posted March 23, 2018 Share Posted March 23, 2018 is this the same as a 1999 Mack CH with the older style dash? mine is fried too. Quote Link to comment https://www.bigmacktrucks.com/topic/52491-heater-fan-wiring-harness/#findComment-394918 Share on other sites More sharing options...
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