Yes, closing the vents on the inside of the AC will force the air through the ducts. You have a larger 5er. Do you have 2 AC's? You should have the Racetrack system which flows AC air through the entire coach. Dual AC's for your rig should be a basic requirement...it would be if we owned it. In our experience 2 AC's blowing through the ducts feels like it triples the air flow over just one AC.
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Jeff & Sandi (and Teddy - 7lb Schnorkie)
2018 Montana High Country 305RL
2015 RAM 3500 Crew Cab 4x4 DRW
Demco Recon Hitch on RAM Puck Ball
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