I fixed my banging pipes problem.
Thor cheaply installs an antifreeze port on the water system (would they do it any other way)?
Instead of doing it properly and installing a 3 way valve (which disconnects the water tank - and - connects the antifreeze port), they cheap out with a 1 way valve and simply disconnect the water tank when you want to winterize and pump in antifreeze.
The top of the antifreeze port is then blocked off with a cap. This (hopefully) prevents the introduction of air into the water line.
In late 2013 when we bought the coach, the dealer winterized it. And mid-year last summer, the pipes began to bang.
When I did the winterization last year, I discovered the cap was not tight. So I improved it by adding a valve to the antifeeze port.
And I summer commissioned the water system today... and no banging pipes.
So my theory was definitely correct, air was getting sucked into the system from a lose antifreeze port cap.
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The only thing that works on a RV is the owner...
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