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Old 03-06-2016, 06:40 AM   #1
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Mystery water leak under coach

We have a water leak in our 2007 Bay Star within the past month. We started noticing water dripping in the water bay from the top of the bay. This appears to be fresh water as it has no smell, soapiness, or viscosity, so it doesn't appear to be coming from a drain but from the incoming fresh water hookup. We are currently in a campground and are using a water regulator.

There is no dripping under sinks or seepage onto the floors inside; the only evidence of a leak is in the water bay. My husband peeled back some of the vapor barrier on the roof of the bay, and there was water on the backside of the plastic as well as damp insulation. Unfortunately the leak seems to be towards the center of the coach as no pipes in the area of the bay roof are leaking. It is a very hard area to see into to figure out where the leak is coming from.

Has anyone else experienced a leak like this? If he can't locate it quickly, we'll have to either take the coach into the dealer (unfortunately we have no extended warranty, and this could be a pricey repair if it needs to go up on a lift) or call a mobile RV technician. Any recommendations? We are new RVers, and this is our first serious problem. My husband has been able to fix the other small issues we've had so far (he's very handy), including replacing the bathroom faucet (also leaking) and the vacuum breaker check valve, which blew out the first time we tried to do a black tank flush. We were hoping the current water underneath was left over from that leak, but since it's still dripping a month later, we don't think so.

Thanks for any advice you more experienced folks can offer!
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Old 03-06-2016, 07:35 AM   #2
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Here's a long shot to check out. I had thought I had my city water valve closed , so it was not putting water into the tank, but in reality, the plastic handle on the valve was a bit sloppy and while it appeared to be closed, it was slightly askew, As a result, when connected to city water, the water tank was getting filled up and dripping out the overflow onto the ground. If by chance, your overflow tube was loose or cracked, it could possibly leak into the internal bay area. Worth a quick check.
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Old 03-06-2016, 07:53 AM   #3
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Last year, I had a water leak, just as you describe. It appeared to be above my fuel tank, which is located about the center of the coach and under the frame. It was fresh water and over a few days, it would empty the water tank, if I didn't continually hook up to an external water supply. I thought I was going to have to drop my fuel tank, to find the leak.

I finally found a panel under the coach, on the driver's side of the I-Beam, adjacent to the fuel tank. The fuel tank rests between the two, I-Beams of the vehicle frame. (It was hard to see, because everything about the frame, is painted black). I took the screws out of the panel and removed it. There was my fresh water tank, directly above the fuel tank. And yes, it was leaking. There are two, separate tanks under there, that hold the nearly 100 gallons of water. The two tanks, were connected by a water hose, similar to a radiator hose. One of the hose clamps had loosened and was the cause of the leak. I simply tightened the clamp, as tight as I could and replaced the panel. No more leaks, afterward!

Of course, this might not be the same about your leak, but your husband could take a look, under your coach. Good luck!
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Old 03-06-2016, 08:55 AM   #4
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First outing in our brand new 2015 DS 4002. Major Water leak into basement, nothing on floor inside the coach. No water pump cycling or visible water line leaks. Appears to be leaky or unconnected kitchen sink drain, in an inaccessible area beneath the floor between the frame rails in the cargo bay ahead of the tank area. As luck would have it, the water spills over onto the slide out control electronics, which I will demand be replaced during leak repair. Taking to dealer to have all corrected.
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Old 03-06-2016, 11:14 AM   #5
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Thanks, folks, for your quick replies.

My husband has located the problem. It was not what he thought, but it turns out that it is the shower after all. He's now got his nose under there, and it's a real mess. It was dripping down in a different area, which made him think it was not the shower, and there really wasn't evidence of soap in the drip, but that is what it is. So, we have moldy framing, wet insulation, and a bunch of wetness under the shower.

Fun, fun -- but I think we're moving forward as at least we've determined where the leak is. That's the first step, right?!
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Old 03-06-2016, 11:18 AM   #6
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Looks like this is our problem:

http://www.irv2.com/forums/f103/bays...ml#post2254824
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Old 03-09-2016, 07:27 PM   #7
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There is one other potential leak in the shower area that I found on my Baystar. The Caulk around the faucet stand can go bad and the entire location can develop leaks. You can confirm this by taking out the 4 screws that hold it against the shower wall and check the inside for evidence of water build up. When taking a shower the water will build up inside the thing and then flow down the interior of the shower stall and in extreme instances continue flowing out of the coach.
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Old 03-10-2016, 06:29 AM   #8
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Thanks Denis! We'll check that too. My husband has the repair in the drain in progress, and so far it appears that this is going to fix the leak, but we can't be too careful.
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