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Old 07-22-2020, 05:56 PM   #1
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National RV Owners Club
Join Date: Jan 2015
Location: Phoenix, AZ
Posts: 11
A/C Blowing air out at dash when in Floor Mode

Hi,

I have a 2004 National Dolphin 6335. It has the Workhorse Chassis with the 8.1L Vortec engine. When I turn my AC control dial from dash mode to floor mode I still get air full blast at dash and very little on the floor. I found 2 vacuum valves that adjust the doors and both work when I switch modes. Could there be a third one? I noticed this when trying to do some troubleshooting to see if the mixing door was closing all the way to only allow cold air when in A/C mode. Still have not figured out where that control is. Any ideas or suggestions would be greatly appreciated.

Thanks in advance
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