WINTERIZING MY 2011 373DS MOTORHOME TODAY...WHEN TRYING TO PUT ANTIFREEZE IN SYSTEM THE WATER PUMP WOULD RUN AND SUCK IN ABOUT 1/2 GAL AND STOP RUNNING..THAN START RUNNING AGAIN WITHOUT DOING ANYTHING TO IT..DID THIS FOUR TIMES UNTIL GETTING 2 GAL IN SYSTEM..ANY IDEAS ON THIS....THANKS FOR YOUR HELP IN ADVANCE
The pump stops because its reaching cutout pressure. Try "cracking open a valve far from the pump to allow air to escape. Then close that valve when the pink arrives and open another. Air escape quickly, not nessary to open fully.