I dewinterized my boat 2 weeks ago during a nice warm sat afternoon. Hooked up water and flushed system out and ran the motor to check connections etc. Installed and tryed out my new Polk speakers and thought all was good,till about 9pm that night Then wam Snowing like crazy.I couldn't stand it watching this so i had to run out and crawl under the tarp during a mini blizzard and take out the plugs on the motor block and drain that at the very least or else i never would have slept that night. Now just waiting till i'm truely ready to use before it goes back together .