The water should drain out of your C-500 case but I would disconnect the lines to make sure they are dry. I would do the same for the trans cooler. but what do i know, in So Calif we use our boats in the winter somewhat. Hey did you get any extra gears with you boat?? Also I have some info on your c-500 you might want. I will send it to you but your e-mail address is no good. Keeps getting returned!