Yes, you have to get water out of the heat exchanger or you could crack it. I took delivery of a closed cooling system in Feb, so I didn't have to winterize, but the dealer told me it is one hose to disconnect to drain the heat exchanger. Any water will freeze and expand so also look at putting antifreeze in the ballast system. If it has a heater, it will already have antifreeze from the motor and will be fine.
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