arodiesel123 Posted October 23, 2018 Share Posted October 23, 2018 (edited) I have a 2013 Mack CHU613 tractor with the ac blower only working on high. I swapped controllers from another truck but didn’t fix it. Is there a resistor or something I’m missing and if so could you please help me with a location. Thanks Edited October 23, 2018 by arodiesel123 1 Quote Link to comment https://www.bigmacktrucks.com/topic/54645-ac-fan-controller-only-works-on-high/ Share on other sites More sharing options...
0 Mackpro Posted October 23, 2018 Share Posted October 23, 2018 If the blower motor only works on high the your correct that it’s usually the resister. Pull off the lower kick panel in front of the passenger seat (4 -T27 screws). You can’t miss the resistor. Large connector and 2 small screws holding it in. We also see lots of burned up wires on the back of the control panel that cause issues. This is a very good time to replace the cabin air filter while the cover is off. Mack has a new style filter out now that like house HVAC filter. 2 Quote Link to comment https://www.bigmacktrucks.com/topic/54645-ac-fan-controller-only-works-on-high/#findComment-408370 Share on other sites More sharing options...
0 E5Farmer Posted February 14, 2022 Share Posted February 14, 2022 I have a similar problem. Cannot control the temperature or modes. Replaced the control unit. Have actuators but I’m wondering if it could be the resistor? Quote Link to comment https://www.bigmacktrucks.com/topic/54645-ac-fan-controller-only-works-on-high/#findComment-489397 Share on other sites More sharing options...
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arodiesel123
I have a 2013 Mack CHU613 tractor with the ac blower only working on high. I swapped controllers from another truck but didn’t fix it. Is there a resistor or something I’m missing and if so could you please help me with a location. Thanks
Edited by arodiesel123Link to comment
https://www.bigmacktrucks.com/topic/54645-ac-fan-controller-only-works-on-high/Share on other sites
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