On my 98 endeaver there is a water by pass for the hot water heater. I just switch it over and pull the tank plug and let the tank drain. Then open low point drains in the water bay. After that , there is a short hose sticking out of the bottom of the water bay, which has a short fitting on it. I just take a piece of hose and push it on it and stick the other end in a bottle of rv antifreeze. turn on the pump and open the faucets, hot and cold one at a time . I think i use 2 gallons. The last thing i do is jump out the ice maker solenoid {120 volt} and it will pump the antifreeze through the ice maker. I don't have to mess with anything else and it only takes about 15 minutes.