Whats with the hot air coming in with the vents with temp controls set at 16C (AC off). It seems to keep blowing in hot air instead of normal outside air...have to turn it off unless i activate the ac. Does the 135 not have a vent setting for outside air only?
Also, what does the circulation option do (button with the A inside the circle of arrows?). Doesn't seem to make a difference

hi there, please check the freon...i suspect the problem is freon.

It should suck in air from the outside as long as you don't have the recirc button hit. The outside air coming in will be a little warmer than the actual temp outside due to where the intake for the vent is (near the engine).

Nadeem