Forderorder Posted May 13, 2022 Share Posted May 13, 2022 I have a the single-zone manual climate control (XL trim) and either I'm not educated on how to operate it or I have discovered a defect. To give some background on what the controls look like, for you guys with the fancy dual-zone systems: The temperature control knob goes from 100% heat (completely clockwise) to 100% cool (completely counter-clockwise). Just past the 100% cool position, it says "MAX A/C". If you rotate the knob to this position, it is a momentary switch and the knob springs back to 100% cool as soon as you let go. There is an LED above the label "MAX A/C" to indicate whether MAX A/C is on or not. Seems super simple. But it only works about 20% of the time. The rest of the time nothing happens when I rotate to the MAX A/C position. Am I supposed to hold it there, NOT hold it there, or some other criteria that the computer decides whether it wants to turn on MAX A/C? I see nothing in the owner's manual about this, so I'm assuming the system should be as simple as it appears. I might have to make a video to show what I mean. Quote Link to comment Share on other sites More sharing options...
Forderorder Posted May 13, 2022 Author Share Posted May 13, 2022 Quote Link to comment Share on other sites More sharing options...
akirby Posted May 13, 2022 Share Posted May 13, 2022 All it does is turn fans on high and turn on recirculate mode. Quote Link to comment Share on other sites More sharing options...
Forderorder Posted May 13, 2022 Author Share Posted May 13, 2022 41 minutes ago, akirby said: All it does is turn fans on high and turn on recirculate mode. Yup, that’s what it should do but it does not always. Quote Link to comment Share on other sites More sharing options...
SpartanFan23 Posted May 14, 2022 Share Posted May 14, 2022 I agree, on my last truck with the same setup, once you moved it to full cold the light would go on and it would blow harder than just the fan on high. Does max defrost work in the other direction? Could be an issue with the switch, dang microchips ? Quote Link to comment Share on other sites More sharing options...
akirby Posted May 20, 2022 Share Posted May 20, 2022 On 5/13/2022 at 4:37 PM, Forderorder said: Yup, that’s what it should do but it does not always. Mystery solved. When you twist it to Max a/c and let go, if the knob moves back even one click for max cold it won’t engage Max mode. You either have to do it carefully so it doesn’t move back, or go to max cold first, then twist and it’s easier to keep it there, Quote Link to comment Share on other sites More sharing options...
Forderorder Posted May 20, 2022 Author Share Posted May 20, 2022 Maybe this video will help you see what I'm referring to. After playing with it, I think the trick is to have the knob all the way counter-clockwise before turning on MAX. If the knob is anywhere else as a starting point it does not work. 2022 Super Duty - Max AC Knob.mp4 Quote Link to comment Share on other sites More sharing options...
akirby Posted May 20, 2022 Share Posted May 20, 2022 It does you just have to very careful with the bounce back. In your video you can see it bounce back more than one click. Quote Link to comment Share on other sites More sharing options...
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