Last weekend I tried to get mine ready for winter. I drained the water heater, turn the bypass poured about 4 gallons of anti freeze in the fresh water tank turned the pump on , opened the faucets. Then nothing but air and a litttle antifreeze, The pump runs but there is alittle fuild here and there. I went back to camper today tried blowing lines out, that worked so i poured more about 5 gallons in fresh water tank. still same thing air and gurgling and alittle fluid. I did this same thing last year with no problem. Also when I shut off faucets, it pumps antifreeze back out the city water connection. Can anybody help me last chance to fix problem before they close park for the season is this coming weekend.. Thanks Billy.