2012 Sportsman 400/500 and EFI Tractor Service Manual 9923412, Page 36Get this manual
MAINTENANCE RadiatorGrill Screen Coolant Level Inspection
The recovery bottle, located on the left side of the machine, must be maintained between the minimum and maximum levels indicated on the recovery bottleRecovery Bottle
1Check radiator air passages for restrictions or damageCheck and clean the radiator grille if needed2Carefully straighten any bent radiator fins3Remove any obstructions with compressed air or low pressure water