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Old 07-11-2018, 11:37 AM   #1
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Angry Water leak into the back passenger basement compartment

2015 MIRADA 35LS which has a bath and a half

On a trip, water began to leak into the large back passenger basement compartment as we drove.

The F/G/B tank were lower than half.

When arriving at a destination, water was dripping from the skirting of the very wet compartment.

The first time it was very damp, which was dried,
The next stop more wet, once again dried,
on the way home the next stop had an inch of water in the compartment!
Every time the water was clean, no smell, no residue.

The Grey and Blank were tanks emptied.
At home, once again dried the compartment, then an unsuccessful search of the leak lead to other investigations.

During the trip the back toilet was not used, but the vanity was.

I checked the back black tank, opened valve and some water did flow out, even though the toilet was not used.

I closed the valve then let the water run in the back vanity sink, then watched to see if the water went into the compartment, soon the water flowed from under the back of the RV, but not into the compartment.

Then I opened the valve and water flowed from the back black tank.
After an exhaustive search on the internet to look for solutions, of overflow, and seals.

I have searched the internet seeking to find a plumping schematic for the 2015 Coachmen Mirada 35ls, with no success.

Please let me know, if anyone has any possible ideas AND solution to this most curious situation.

Irisheyes756
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Old 07-12-2018, 06:44 AM   #2
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Welcome to the forum its a great place to get your questions answered. From your description it sounds like the connecting pipe from the sink to the black tank has come undone somewhere. Look at the piping under the vanity pull some panels in the storage area and or remove the underbelly covering in that area and search for the disconnect. Let the forum know how you proceed and what you find or fix.
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Old 07-13-2018, 09:46 AM   #3
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Thanks, checked the pipe from the vanity sink as far as I could see, could not find any leakage or wetness. Pulled the panel, but a bit reluctant to go under...

With water still in the Fresh tank, after a day or two found water in the second black sewer compartment, clean, no smell or residue, (opposite side from before) then checked the area around the water heater bypass, (the compartment next to it) nothing.
There was no water that flowed from the black water.

Possibly the fresh water is leaking in area... or
Was wondering if the black release valve for the black water could or the piping be leaking, causing water to leak ~ from side to side Plausible?

Made an appointment at repair shop, but would love to avoid this appointment.

Open to suggestions...

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