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Old 10-03-2018, 06:33 PM   #1
Winnebago Watcher
Join Date: Aug 2018
Posts: 3
Dash AC Problem

My dash ac stops blowing cold when idling but blows ok cold air when driving, any recommendations to diagnose myself? Iíll check the fans up front first.
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Old 10-03-2018, 09:32 PM   #2
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Location: Houston TX
Posts: 881
It would be helpful if you included info about your RV... make, model, etc.
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Old 10-03-2018, 09:46 PM   #3
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Join Date: May 2015
Location: Manhattan, Kansas USA
Posts: 885
Try it on Max AC this cools air from inside the RV that is drawn from a duct under the front dash by the floor on the passenger side.

When idling the air temp at the fresh inlet under the front cap in front of the radiators increases by as much as 30 degrees F and so the AC is now cooling much hotter air. In the worst case the air coming out of the dash vents can be hotter than the current air inside the coach.

When on recirc the air being cooled is from inside the RV so this effect is avoided.

Once I figured this out I now just use Max AC all the time.
Randy - Manhattan, Kansas
2015 Vista 27N
2016 Honda HR-V
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Old 10-09-2018, 01:43 AM   #4
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Join Date: Nov 2010
Posts: 56
I resealed down the sides of the chassis motor fan shroud and that helped very much.
03 Workhorse 22K Winnebago Adventurer 35U
2012 Honda CRV and 2001 Nissan Frontier
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