Thanks for the reply. Is the extra knob directly below the hazard lights button in your car? If so I think this is only for the auto AC versions. My car doesn't have that and doesn't have vents in the rear either. Found these images below with the manual vs auto set up.
The hot air is blowing equally from all vents and the only way to stop it is turn the fan off or turn the AC on. It only happens when the car has been driven for a while.
If you turn everything onto cold and turn off the AC (so car is just pulling air in from outside without AC cooling) is your car blowing hot or ambient air temps through the vents?
