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Old 06-08-2020, 08:35 PM   #1
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Brand: Thor Motor Coach
State: Georgia
Posts: 42
THOR #6090
Water leak in basement

We havenít gone camping yet due to several family issues. After de-winterizing, we were going to fill the fresh tank and then drain gray water. All went well until we notice two of the outside compartments has water in them. The water is coming from the top part of each compartment. This area is under the sofa and not where the sink is located. The third compartment, which is located under the sink, and is the one that has the outdoor shower and it had a little water in it. We have a 2018 ACE 29.3. We have checked under the sink and behind the sofa and we see no signs of water. Any suggestions?

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Old 06-08-2020, 09:15 PM   #2
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Model: Sunstar 29VE Winnebago
State: Texas
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THOR #13058
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Originally Posted by travelingcat View Post
We havenít gone camping yet due to several family issues. After de-winterizing, we were going to fill the fresh tank and then drain gray water. All went well until we notice two of the outside compartments has water in them. The water is coming from the top part of each compartment. This area is under the sofa and not where the sink is located. The third compartment, which is located under the sink, and is the one that has the outdoor shower and it had a little water in it. We have a 2018 ACE 29.3. We have checked under the sink and behind the sofa and we see no signs of water. Any suggestions?
You sound to be out of warranty. Here is what I would do.

1. Have Thor give you a plumbing diagram
2. It is likely only one leak during all of the damage but I can't know without diagram.
3. I would then drain everything, bone dry and clean up all of the leaked water in compartment.
4. Stop using any water o sink in coach.
5. Fill fresh water tank in full, report what happens. If nothing happens drive it and then report what happens.
6. If you see water in all of the places you know you have leak with fresh water tank that is likely under floor. You may need dealer to repair that but it is cheaper if you know the problem
7. If no leak and fresh tank is clear, then I go into coach and turn on faucets that go to gray tank. Repeat above using all fresh water; so if it does leak in your basement it is just clean water.

I suspect a seal directly above a tank that is for vent etc may be leaking. Hopefully there is no leak in the tank it self.
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Old 06-08-2020, 09:46 PM   #3
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Model: Tiffin Wayfarer 24 BW
State: New York
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THOR #8860
One leak, and the water is moving along the coach underneath the flooring...
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Old 06-08-2020, 11:00 PM   #4
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Model: 36FB
State: Arizona
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THOR #3610
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Originally Posted by travelingcat View Post
We havenít gone camping yet due to several family issues. After de-winterizing, we were going to fill the fresh tank and then drain gray water. ?
Maybe I'm reading this too literal?
It says you're "filling the fresh water tank & draining the grey", I'm reading this that you're filling the fw & trying to drain it by opening the grey tank, that WILL NOT work unless you've pumped the fresh water down a drain. If this is the case you've possibly overfilled the fw tank, possibly ruptured it, causing the leak.
Hopefully I've read it too literal & I this is not the case!
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Old 06-09-2020, 12:42 AM   #5
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THOR #13058
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Originally Posted by Travelin' Texans View Post
Maybe I'm reading this too literal?
It says you're "filling the fresh water tank & draining the grey", I'm reading this that you're filling the fw & trying to drain it by opening the grey tank, that WILL NOT work unless you've pumped the fresh water down a drain. If this is the case you've possibly overfilled the fw tank, possibly ruptured it, causing the leak.
Hopefully I've read it too literal & I this is not the case!
I could see this angle too. When I read again this phrase confuses me.. "After de-winterizing," OP didn't say if leak was already there or only when they started adding fresh water? I would think gray tank & fresh water tanks would be empty before and after de-winterizing? Maybe some of the pink stuff, but if that was used OP would know the leaked water is the pink stuff.

Do the ACE 29.3 not have a overflow drain for freshwater? Even if it does if incoming water is not regulated and well above 60 psi or so, it could burst that tank, although Winnebago told me those tanks should easily withstand 80 psi and more. My coach overflows at the rear harmlessly to the ground. That is what I use to stop to ensure I have maximum water in my tanks
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