8 years with no HVAC issues. Last week I changed out the HVAC controller for a used one (my old one had 2 lights out).
All good until this morning; only have heat on the left side. After 20 minutes of driving, I feel a little bit of heat from the right side, but hardly what is coming out of the left side., and the air flow feels weak.
I guess I will but the old controller is and see what happens. Could be controller? Or blend door actuator? Could low freon cause this?