2009 Strada GLS Sport --- Anyone experienced warm air blowing from the 2 driver side vent, while on the 2 passenger side vent it is blowing normal cool air?
I'd like to assume that something maybe wrong with your linkages (the things that move when you turn those knobs). On some brands its linkages, on others its a combination of linkages and cables. IMHO, these are your main culprits, as these are the ones responsible for switching cold to hot air or vice versa, or a mixture of both, along with the shutting flaps. Bring your car to a competent AC specialist, I think they can figure it out.