Next time your in have them check your outside ambient air sensor. This is located in the grill area and if you hit anything it can bust the harness.
I hit a retread (truck had a blowout right in front of me) and mine shattered. The truck then thinks it 0deg outside, so all heat, no air.
Have the harnesses for sale ebay.com/itm/126939646204?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=qWOapheeTV2&sssrc=2051273&ssuid=qWOapheeTV2&var=&widget_ver=artemis&media=COPY