You don't say if you did the AC install or if a shop did it. There should be no direct air flow between the outside and inside of the AC, but I would make sure everything looks correct. Then I would make sure that someone didn't sit on the sewer vent cap or damage it in some way. Also make sure the bathroom ceiling vent is closed when traveling (will create quite a vaccuum and suck in smells and dust and dirt. A few times if the wind was in the right direction we would get some sewer smell coming back down from that vent if open when parked.
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Michelle & Ann
2018 Chevy 3500HD High Country DRW 4X4 Crew Cab w/Duramax/Allison, Formally 2010 Montana 2955RL, Now Loaded 2016 SOB, Mor/ryde IS, Disc Brakes & Pin Box, Comfort Ride Hitch, Sailun 17.5 Tires.
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