Good Sam Club Open Roads Forum: Class A Motorhomes: High humidity
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 > High humidity

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RLS7201

Beautyful Downtown Gladstone, MO

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Posted: 05/24/20 10:19am Link  |  Quote  |  Print  |  Notify Moderator

Open the cabinet doors under the vanity and sink and see if the smell is strongest there. There is a good chance one of the air admittance valves have failed. Those valves allow the waste water to drain without sucking the "P" traps empty. Easy change, usually only hand tight. Available at all the big box stores.
Your ACs only recirculate air, they do not bring in outside air.

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2oldman

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Posted: 05/24/20 10:30am Link  |  Quote  |  Print  |  Notify Moderator

Not sure what humidity has to do with it.

wolfe10

Texas

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Posted: 05/24/20 10:52am Link  |  Quote  |  Print  |  Notify Moderator

2oldman wrote:

Not sure what humidity has to do with it.


Actually, quite a lot. RV roof air filters aren't very efficient at removing dirt.

In humid weather, the evaporator coils stay pretty wet.

Dirt plus water plus warm temperatures= mold, mildew, etc growth.

Again, if worse when first starting the A/C, that is the likely cause.

In New Mexico, not an issue.


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Gazelle05

Gig Harbor,Wa

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Posted: 05/24/20 12:31pm Link  |  Quote  |  Print  |  Notify Moderator

I just cleaned both ac coils, no smell under cabiners, running fan only on ac units thru all the ducks no smell.
Thanks for all your suggestions.
I'll let you know what the problem is when I find it.

Gazelle05

Gig Harbor,Wa

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Posted: 05/24/20 01:02pm Link  |  Quote  |  Print  |  Notify Moderator

I have placed ziplock baggies filled with water over all drains in the sinks and shower.
Smell has deminished thank you looks like air admittance valve has gone bad draining the pea trap.

Executive

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Posted: 05/24/20 01:06pm Link  |  Quote  |  Print  |  Notify Moderator

Don't forget the washing machine "P" trap....Dennis


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down home

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Posted: 05/24/20 05:53pm Link  |  Quote  |  Print  |  Notify Moderator

Inside cooled and/or heated air is isolated from outside air.
If it stinks in side either there is a dead something came in though roof and into vents to ac probably or other.
A cleaning top side and inside won't hurt. Ask Coleman how to clean inside coils etc without taking unit off roof. I have some ides but they knwo what works best probably without making a mess. Humidity is a problem when it is hot but when it is raining it is really worse as the humidity overpowers the inside as the unit shuts down as the temp fall below the thermostat. I have had to turn on the engine and dash air defrost more than once to get rid f it. Rec Vehicle heat pumps should have a dehumimidifying function, and perhaps some of them do but I have seen no adevertiesments of it. I bought a dehumidifier about 240.00 from Lowes sometime back to set in the sink or shower but it is at home now.

opnspaces

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Posted: 05/25/20 01:54am Link  |  Quote  |  Print  |  Notify Moderator

An air admittance valve can be as cheap as $7

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