Polaris Series 10 Ranger 425 2x4 - Manual (Page 86)

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MAINTENANCE AND LUBRICATION
Engine Cooling System
Radiator and Cooling Fan
Check and clean the screen and radiator fins for obstruction by insects
or mud in accordance with the Periodic Maintenance Chart.
Do not obstruct or deflect airflow through the radiator by installing
unauthorized accessories in front of the radiator or behind the cooling
fan. Interference with the radiator airflow can lead to overheating and
consequent engine damage.
Coolant absorbs excessive heat from the engine and transfers it to the
air at the radiator. If the coolant level becomes low, the engine
overheats and may suffer damage. Check the coolant level each day
before operating the vehicle, and replenish coolant if the level is low.
Change the coolant in accordance with the Periodic Maintenance Chart.
CAUTION
Using high-pressure water, as from a car wash facility, could
damage the radiator fins and impair the radiator’s effectiveness.