I will also connect antifreeze to pump inlet but run the machine in short (15 seconds) of a hot water then pump it out. Then run it again but on a cold wash cycle (15 seconds) and pump that out. Then one more time in a warm wash and pump it out. This way I ensure that all three valves and the pump is prevented from freezing. I will usually do about 50 washers a year; never had one freeze.
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Mike, RVIA & RVSA Certified Master RV Technician
Amy, Dr. Assistant - Roxie & Mei Ling, four legs each
2000 Gulf Stream Scenic Cruiser 450 hp & 1330# torque
06 Saturn Vue, 06 Chevy Z71 4x4 & 2014 Corvette Z51 M7
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