This year I found a plug in the bottom front of the muffler, drained that and the strainer before I pumped antifreeze (Rv) through, thought was that the antifreeze would be less diluted and it would require less fluid. It took one and a half jugs to get pink stuff in the pail out back. I use the shop vac on all the plumbing lines before I add antifreeze as well. The one thing that concerns me is the water heater, I'm never sure I get enough water out, but I make sure I get some antifreeze back into it. So far, so good. Brad "Pulse" 1985 33 MKII Lake Huron
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