I have a 335SS Cruiser, which is similar to the Rushmores, and the only thing that I can think of is that the tubing that actually bypasses the hot water tank is crimped or blocked somehow. Note that you should flush the hotwater tank repeately as soon as possible to get the anti-freeze out of it, but then you would not be winterized.
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Boomer, the Better Half and our Yorkie - Ellie
2012 335SS
2009 Chev 2500HD 6.0 L gas
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