We used the RV Airflow systems that Brent linked above, but that only works with specific types of AC units and may not be suitable for yours. One other problem I've read about is the ducting actually collapsing on some units blocking the airflow. But it would be best to take it back to the dealer first and let them diagnose the problem especially if it is under warranty.
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2017 Avalanche 320RS 5'er
2022 Ford F-350 Lariat Ultimate with 6.7L Diesel
Andersen Ultimate 5th Wheel hitch
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