Polaris PRO XD Owner's Manual page 119

OVERFLOW BOTTLE COOLANT LEVEL
Always check and change the coolant at the intervals outlined in the Periodic
Maintenance Chart. Maintain the coolant level between the minimum and
maximum marks on the bottle (when the fluid is cool).
1. Position the vehicle on a level surface.
2. Lift the hood. View the coolant level in the overflow bottle
3. If the coolant level is below the safe operating range, lift the hood and locate
the overflow bottle lid. Remove the cap and use a funnel to add coolant
through the filler opening. Reinstall the cap.
If coolant must be added often, or if the overflow bottle runs completely dry,
there may be a leak in the system. Your dealer can inspect the cooling system.
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