I have a 2007 Commander. My A/C driver's side is getting cool air but the passenger's side seams to be getting a mix from outside air. What I have checked so far is turning a/c on, front and rear. In doing so I get cool air on driver and in rear with warm air from passenger vents and middle vents of second level seating. I think it is the blending actuator behind my glove box. Any thoughts or knowledge of this phenomenon?