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Old 06-29-2022, 06:27 AM   #1
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AC always on, on my 37F

On my 2013 37F motorhome, my AC is always on. Even when I have set my selector switch on "VENT" the engine AC is still on... I noticed condensate draining when I stopped, and noticed that the AC connection was frosty - clearly running. Is this normal? Anyone out there with a similiar F53 seen this? What could cause this? Suggestions?
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Old 06-29-2022, 07:09 AM   #2
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I would say getting the wiring info from Winnebago , for your coach is in order.

Check to see if there is a relay in the compressor control circuit , and check it for sticking on.

http://www.winnebago.com/Files/Files...ram/Wiring.htm
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Old 06-29-2022, 07:20 AM   #3
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Quote:
Originally Posted by Iceman-31D View Post
On my 2013 37F motorhome, my AC is always on. Even when I have set my selector switch on "VENT" the engine AC is still on... I noticed condensate draining when I stopped, and noticed that the AC connection was frosty - clearly running. Is this normal? Anyone out there with a similiar F53 seen this? What could cause this? Suggestions?
You have 2 buttons on the panel. One for recirculate and the other for compressor/AC. Did you push the AC button off?
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Old 06-29-2022, 11:57 AM   #4
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Many automotive cabin air systems work that way. Both my 2015 Mazda 3 and my 2015 Nissan pathfinder work that way.

I can turn the cabin system "off" and open the windows. However, even in the winter when I turn the heater "on", the A/C runs when it thinks it should.

This is normal smart system behavior. Running the A/C in the winter defrosts the windows. The heater runs at the same time.

I have tried to run in the summer with just the fan blowing. No joy. A/C still starts when it thinks it should. The only way to shut down the A/C is to turn the temp setting up. But, then the heater starts up.
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Old 07-05-2022, 05:56 AM   #5
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Thanks guys. Good suggestions. So far I think the "always on if it thinks it wants to" theory makes the most sense. When (if?!) I come across some hard documentation I will re-post.
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Old 07-06-2022, 12:08 AM   #6
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Thanks guys. Good suggestions. So far I think the "always on if it thinks it wants to" theory makes the most sense. When (if?!) I come across some hard documentation I will re-post.
I may be totally off base but I don't think it makes that much sense. Sure the compressor cycles when defrost mode is chosen. But I don't think it should run at all when in the vent setting. What would be the point of the vent setting if that were the case? I would bet there's something in the controls, a switch or maybe a relay that's not working correctly.
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Old 07-06-2022, 01:57 PM   #7
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Originally Posted by Persistent View Post
Many automotive cabin air systems work that way. Both my 2015 Mazda 3 and my 2015 Nissan pathfinder work that way.

I can turn the cabin system "off" and open the windows. However, even in the winter when I turn the heater "on", the A/C runs when it thinks it should.

This is normal smart system behavior. Running the A/C in the winter defrosts the windows. The heater runs at the same time.

I have tried to run in the summer with just the fan blowing. No joy. A/C still starts when it thinks it should. The only way to shut down the A/C is to turn the temp setting up. But, then the heater starts up.
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