Idk whats up with my boat it wont start... It went down to 27 degrees last night so heres what i did today. Drained everything, risers, block, and took off all other water hose and let the water out. Took out thermostat and filled the block to the top with quicksilver antifreeze. Then filled each hose coming off the thermostat housing with antifreeze.. pulled the hose off the raw water pump housing and made sure it was emptied and put antifree in it so it reached the impeller (cranked engine over). will this be ok? i left the antifreeze in the block but drained the risers again. should i keep the riser filled? thanks alot guys.