Problem with 2007 MKX AWD Dual Control climate system - A/C works great both sides, but when put in heating mode, either for dual control or single control, no heat comes out on driver's side - but does fine on passenger side. I have run DATC reset on climate control system, no codes encountered on looking for DTC's with self test. I have replaced blend door actuator driver's side and checked it's operation - it appears normal, yet problem still exists. Any ideas as to the correction? Seems to me the flap door for the heater control driver's side may be stuck, but that's just a theory.
Rare