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Old 07-28-2016, 06:56 PM   #1
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Sewer smell when A/C is running

We have a 28' Coachmen Apex. This is our 3rd summer with it. While out camping last week, we turned on the air and after awhile it began to smell like sewage in our trailer. The black and gray tanks were both closed. I felt like the smell was the worst when I would open the bathroom sink cabinet. I have a hard enough time running the air because it is loud and now with this smell, I really don't want to even turn it on. I faintly remember this happening last summer too. Please help!
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Old 07-28-2016, 07:19 PM   #2
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I would think the smell is being drawn into your rig by the a/c from your rooftop sewer vents. If that's the case there are different types of vent pipe covers you can try. Also might want to switch the chemicals you use in your tanks. We use Odorlos and rarely have any smell issues.
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Old 07-28-2016, 07:41 PM   #3
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Oh... Also check your a/c filter inside, and then go up on the roof, take off the shroud and make sure your drip pan is draining properly and not leaving stagnant water in the pan.
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Old 07-28-2016, 08:12 PM   #4
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We had the same problem with our Cedar Creek 34RL. I found a vent under the bathroom sink and replaced it. Since then.......no smell. You need to go to Home Depot and get one of these: Oatey 1-1/2 in. ABS PTC In-Line Cheater Vent-39012 - The Home Depot
It is a one-way vent that allows air to enter the waste tank. It is supposed to keep the foul air inside but sometimes they leak. Just replace it and you will be good-to-go.
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Old 07-28-2016, 08:26 PM   #5
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It sounds like the air admittance valve, as mentioned above. Easy to clean, or perhaps replace. Look for it under the bathroom sink. It is pvc and just screws on.
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Old 07-28-2016, 09:20 PM   #6
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Quote:
Originally Posted by CedarCreekWoody View Post
It sounds like the air admittance valve, as mentioned above. Easy to clean, or perhaps replace. Look for it under the bathroom sink. It is pvc and just screws on.
Learned something new today! I've never heard of a vent inside the rig! I looked at ours and thankfully don't have one. Thanks for the new info!!!
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Old 07-28-2016, 09:27 PM   #7
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Besides that the a/c does not draw outside air to the inside.


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Old 07-28-2016, 09:34 PM   #8
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Originally Posted by TURBS View Post
Besides that the a/c does not draw outside air to the inside.


2015 Columbus 320RS
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2015 nights camped "34"
2016 nights camped "22"
Hey turbs! You know I've heard that, and know that's the way it's supposed to work but it sure seems like those nasty outside odors come in when the a/c is on
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Old 07-29-2016, 12:39 PM   #9
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Probably your air drawing in smell from the campgrounds sewer vent pipe. If you see a pipe sticking 8 to 10 feet up from the ground don't camp in that site.
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Old 07-29-2016, 12:56 PM   #10
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Quote:
Originally Posted by NMWildcat View Post
Learned something new today! I've never heard of a vent inside the rig! I looked at ours and thankfully don't have one. Thanks for the new info!!!

IT'S there.........
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Old 07-29-2016, 01:06 PM   #11
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Smell

Though we have a Class A..beware that your battery(s) when overcharging will tend to boil up sulphuric acid and eventually explode...true..have actually experienced this issue and was fortunate to research the Forum and find out the problem......one battery was actually boiling and getting ready to explode!

Hoping this is not your problem,

George
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Old 07-29-2016, 04:40 PM   #12
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Dead critter in the A/C enclosure?
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Old 07-29-2016, 06:41 PM   #13
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Air Admitted ancestors Valve

Quote:
Originally Posted by NMWildcat View Post
Learned something new today! I've never heard of a vent inside the rig! I looked at ours and thankfully don't have one. Thanks for the new info!!!
Photo under sink in bath. See the black pipe going up from the trap? The valve is at the top.

Hmmm. Photos are sideways.
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Old 07-30-2016, 07:48 AM   #14
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I think what you guys are talking about is an Air Gap,,, not a valve !!!
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Old 07-30-2016, 07:51 AM   #15
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Thanks! Hubby replaced the air gap/admittance valve under the bathroom and kitchen sinks. We will know if it worked the next time we take it out. Appreciate all the comments and suggestions!
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Old 07-30-2016, 07:54 AM   #16
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Quote:
Originally Posted by TURBS View Post
Besides that the a/c does not draw outside air to the inside.


2015 Columbus 320RS
2008 2500HD Duramax
2015 nights camped "34"
2016 nights camped "22"
Right On TURBS !!!
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Old 07-30-2016, 08:05 AM   #17
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Originally Posted by Wolverine 1945 View Post
I think what you guys are talking about is an Air Gap,,, not a valve !!!
Sometimes called that, but proper name is air admittance valve, because it allows air to move into the drain but not out.
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Old 07-30-2016, 08:27 AM   #18
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If this under sink trap doesn't work, then check the direction of the prevailing winds when your AC is on. If the roof vent is upwind of your AC and you smell it, but you don't smell it when it's downwind, then it is coming from the roof vent.
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Old 07-30-2016, 08:42 AM   #19
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I am guessing TURBS,,, that MOODMAN does not agree with us ???
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Old 07-30-2016, 08:48 AM   #20
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I'm giving him another option.
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