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I'm planning on changing my coolany in my 500 Sportsman soon, what's the best way to drain the old coolant? Should I flush with water before refilling?
 

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I just did mine 2 weeks ago. Diconnect the bottom radiator hose on the right side of the bike. Let drain. Attach hose. Fill with water run bike to flush coolant. Fill with 50/50 premixed GREEN coolant that is aluminum safe. Fill while bike is running to purge air. Bubbles will come out.

Now for the overflow bottle..... Unscrew it remove it. Remove cap drain. To fill fill in between max and min and after running the bike and a little ride down the driveway you will have to refill it and make sure it is in between the max and min level

No matter what year, use the bottom radiator hose on the right side of the radiator
 
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