Quote:
Originally Posted by BobD17
I have a 2021 Seneca 37K. We have been Florida for the past month and on occasion we had to use our air conditioning. During operation sometimes we get a foul odor not all the time from the rear ac unit. Pulled the cover to check the drains on each unit and they are both open and clean . Has anyone else had this problem and have a possible fix. I have read about the rear ac unit possibly could be pulling the odors from the black and gray tank vents. Also the front unit drains water from the drain when running but the rear is doesn’t. Thanks
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Unless something has radically changed in how the A/Cs are designed they only recirculate inside air. Unless there is a problem they do not take in any outside air. You might consider removing the ceiling fixture and check that the evaporator coil itself has not got mildew on it, it can happen when dust deposits itself on the coil and then gets damp.
And the next possibility is not pleasant at all, but I know of one Seneca owner that had a mouse get into the ducts (somehow?) in the ceiling/roof assembly. It expired there and made quite a stink. It was discovered by using a fiber optic camera and extracted using a claw tool.
Regarding sewer smells, Jayco has missed sealing the vent pipe roof penetrations on a number of Senecas. Owners remove the vent pipe cover (requires removing some of the lap sealant) and discover that where the pipe comes through the roof is was never sealed and odors can find their way from the roof down into the coach. And if Jayco did not seal the area above the interior A/C ceiling assembly it
could leak into the airflow.
Another issue I've experienced myself were defective "Air Admittance Valves" (AAV) used the plumping to facilitate venting of the sinks and laundry drains. They go bad and can stick open and admit odors into the interior. And even though they come from the grey tank sometimes they can smell as bad as the black tank. And if one camps with the grey valve open it does create a direct path from the sewer to the interior if the AAV is stuck open. Turn on an exhaust fan and you're almost guaranteed to draw in odors. A picture of my original AAV is attached. There are three in my 2014TS.