My Polaris overheated the other day. I stopped to do something and left it idling. The overheat light came on. When I started moving, it went off. When it cooled down, I checked the anti-freeze. It was low. I will change the anti-freeze next time I go to the lease. Should I flush it out before adding new fluid? Can I use a flush designed for an automobile? I plan on using Polaris anti-freeze.