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I would open the cabinet doors where there is plumbing and keep the heat on. Today is the last mild day before some cold nights so it is important to resolve this. On my trailers, I attach a connection directly to the pump and use one container to do the whole trailer. Your back flow valve may be stuck open and you could be sending all the antifreeze into your fresh water holding tank. My winterizing kits usually come from ctc.
Good luck.
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