Timk Posted July 19 Share Posted July 19 Help needed! I’ve replaced the blower fan, resistor, and control panel and still nothing! Any ideas on what else it could be? Quote Link to comment https://www.bigmacktrucks.com/topic/74355-heatair-stopped-working/ Share on other sites More sharing options...
Mackpro Posted July 21 Share Posted July 21 Check fuses up in top of dash, there should be a bigger square on for the blower motor then one for the control panel. Also there is also one labeled something like sleeper AC or Sleeper HVAC , check this one as well even if you don’t have a sleeper. If all that is good see if the control panel lights up if you push the fresh air / recirculate button or the AC button. The HVAC unit has its own wiring harness that plugs into the main cab harness, you can see this harness connection to the left of the HVAC unit, well below the dash fuse box. The harness is known to rub on the metal braces and brackets in the area around the harness connector. Quote Link to comment https://www.bigmacktrucks.com/topic/74355-heatair-stopped-working/#findComment-555619 Share on other sites More sharing options...
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