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Old 08-04-2010, 05:30 PM   #15
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Workhorse Chassis Owner
Join Date: Mar 2007
Posts: 320
FOUND IT. On page 286 of pages 8512 in the 1999-2003 Service Manual on disk, it says

"The air conditioning (A/C) fan pressure switch is located on top of the receiver/dryer. The switch is normally open, but closes as a result of rising pressure. When the switch closes, the fan relay is energized. The switch requires 1620.3 kPa (235 psi) +/- 206.8 kPa (30 psi) to close."

There is no mention of A/C systems in the 2004-2005 service manual on the same disk.

2005 30' Rexhall Vision, W-22 chassis, 19.5 tires, 208'' factory WB, 6000 CCC
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Old 08-29-2010, 08:37 PM   #16
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Join Date: Aug 2010
Location: Coto de Caza, CA 92679
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I have a continuing problem such as yours with my Workhorse W-22 chassis and Winnebago. I am going to check the Evans valve (shuts off heater water) based on other feedback. At highway speed, I would think the electric fans are a 'mute' issue....with all the air available. Mine seems to be either vacuum related, or heat related.......Good luck!!

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