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This is exactly the way I have been winterizing the old Challenger ever since day one. Never had any problem. Also, discovered that if I open all faucets, the pressure releif valve on the hot water heater and then, open the low point drains, once all of the water in the lines and water heater is drained, I get very little water from any of the faucets when I hook up air to blow everything out. Seems to allow a minimum of water that goes down into the holding tanks. The tanks have already been drained and back flushed so, I don't worry about that little bit that is going to freeze solid because, the tanks are vented and there is room for that to freeze without damaging the tanks. Besides, there is most likely some pink in the tanks anyway because of what I poured down the p-traps and toilet.
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