Vents not changing

[Polaraco]

I think its related to how often the recirculate function is used on the truck - I believe that door is what opens/closes to let air in from outside or traps and recycles the air.....I cycled it a bit with AC use down here in TX

I never touch it. Actually the outside air is usually cooler than the cab anyway. Check it out.

I would expect the directional door to be more of a problem.

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