Blowing the lines with antifreeze.
I have a friend that is leaving his TT setting at his seasonal site all this winter. We are in MN where the temps will get to -20 F in the winter. Last year was his first year of owning a TT and he to...
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Check the lines between the water tank and the water pump. There may be a T and fitting for winterizing. Mine has a valve in the line before the pump, and a fitting to attach a hose to the AF bottle. Just attach the bottle, rotate the valve, then pump AF through the entire system with the water pump.
