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Old 04-20-2019, 03:05 PM   #1
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What is this for

See coach info in our signature.

Is it ok to block this area to stop cold draft coming in?
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Old 04-20-2019, 03:22 PM   #2
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More than likely it is the fan intake for the air-conditioner and the heater. Take a piece of toilet paper or tissue and lay it against the vent then turn on the blower fan on the dash and see if it sucks to it.
I had a Lowes plastic bag get sucked against mine in my pick up truck and lost our AC thankfully it was an easy fix.
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Old 04-20-2019, 03:31 PM   #3
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x's 2 furnace or A/C return air. I'm betting furnace.
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Old 04-20-2019, 03:39 PM   #4
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Dash HVAC recirc air inlet, yes.

May not be opening and closing correctly. On my Winnebago with SCS Frigette HVAC, the vacuum can that operated the recirc door failed. It is exposed to splash from the right front wheel, and is mounted is such a way that it collects water inside it. If yours has failed, the door may be stuck partially open letting outside air directly into the interior.
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Old 04-20-2019, 03:53 PM   #5
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Looks like fresh air intake for aqua hot or discharge air.
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Old 04-20-2019, 04:24 PM   #6
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Originally Posted by tderonne View Post
Dash HVAC recirc air inlet, yes.

May not be opening and closing correctly. On my Winnebago with SCS Frigette HVAC, the vacuum can that operated the recirc door failed. It is exposed to splash from the right front wheel, and is mounted is such a way that it collects water inside it. If yours has failed, the door may be stuck partially open letting outside air directly into the interior.
Hey Tim,

My dash air and heat work fine but.......
I'll check to see if that door is opening and closing or in other words working properly. But I've just taken a closer look at this and the way our coach is, there's no way any water could get up into this area. Front, top and rear wheel wells are totally enclosed so no water could find it's way up further to where this unit is mounted on the top back of the firewall, in the engine bay and accessed by opening the hood. But...I went online to find some diagrams based on what you said and I do see these "vacuum coils" you mentioned. I don't think my actual unit is listed in this PDF because mine says Evans on the outside of the box when I looked under the hood and this PDF only covers Winniebago 2003 thru 2009. But these diagrams and parts list make clear what's going on in there.
See attached PDF.
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Old 04-20-2019, 04:51 PM   #7
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One thing to check is before you turn off the engine, make sure the dash AC is on recirculate to close off the outside air vent. Do not block of any furnace vents or returns.
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Old 04-20-2019, 05:06 PM   #8
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One thing to check is before you turn off the engine, make sure the dash AC is on recirculate to close off the outside air vent. Do not block of any furnace vents or returns.
Well....not sure what you mean by this but my dash controls do not have a recirculate setting.
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Old 04-20-2019, 05:35 PM   #9
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Max air usually closes outside input and recirculates.
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Old 04-28-2019, 02:17 PM   #10
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From the picture of your a/c-heat control. you have the Evans Tempcon. Go to their website to get information and drawings.
Evans Tempcon Michigan, LLC > Home
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Old 04-28-2019, 02:33 PM   #11
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Are Bigfoot Hydrulic Cylinders rebuildable
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Old 04-28-2019, 05:07 PM   #12
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Max air usually closes outside input and recirculates.


Spot on!
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Old 04-29-2019, 11:46 AM   #13
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Are Bigfoot Hydrulic Cylinders rebuildable
I need to replace the tires on my RV. Im thinking about Michelin any ideas.
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