I think you should find another AC owner and compare fan air volume before spending money to fix something that probably isn't broken. The dash air fans in my '04 seem to produce mostly on speeds #2 & #3. #1 is almost nothing and #4 is noisier than #3 but doesn't seem to move much more air. I suspect that the air ducting and/or inlet door simply doesn't let much more air into the system, so increasing the fan speed only makes it spin faster but there is no more air to move through the system.
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Gary Brinck
Former owner of 2004 American Tradition and several other RVs
Home is now West Palm Beach, FL
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