Polaris RZR 4 900 EPS 2017 Owner's Manual page 104

MAINTENANCE
Cooling System
Radiator and Cooling Fan
Always check and clean the screen and radiator fins at the intervals
outlined in the Periodic Maintenance Chart beginning on page 81. Do
not obstruct or deflect air flow through the radiator by installing
unauthorized accessories in front of the radiator or behind the cooling
fan. Interference with the radiator air flow can lead to overheating and
consequent engine damage.
NOTICE: Washing the vehicle with a high-pressure hose could damage the
radiator fins and impair the radiator's effectiveness. Using a high-
pressure system is not recommended.
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