I have a 2006 34N and I drain fresh water tank , then open outside shower valves which is low point on coach, also opening all outlets and cycle toilet valve to drain. Then drain water heater tank and leave out plug, switch valves on water heater to bypass tank. Then I blow out system by attaching adapter to fresh water intake and use air compressor. I then only put rv antifreeze in drains. If you don't have compressor, hook up hose to water pump intake and suck pink rv antifreeze into system and have it run threw all outlets hot and cold and flush toilet.
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