2013 Chevrolet Malibu, Drivers side vents (all) bring in outside air. Hot in Summer, cold in Winter. Passenger side works.
The drivers side center(left), floor, and dash vents all bring in the outside air.
The passenger side vents work as designed. I first noticed this Summer when
the a/c wasn't cooling as well as it should. But it wasn't until the first cold
weather that I realized it was the driver's side only. What could be the
potential issues with this? Thanks.