Polaris 600 RMK - Manual (Page 88)

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MAINTENANCE
General Maintenance
Coolant High Temperature Indicator Light
The high temperature indicator light will illuminate when engine
coolant temperature becomes too hot for safe continued operation of
the engine. If you must drive your machine after the high temperature
indicator light has come on, drive slowly and stop frequently to allow
the engine to cool down. Driving in deep snow will also help cool the
engine. See your dealer for service. Add coolant if the level is low.
NOTE: Engine performance will be reduced if you continue operating
when the high temperature light is on.
Flushing the Cooling System
To ensure that the coolant maintains its ability to protect the engine,
the system should be completely drained every two years and a fresh
mixture of antifreeze and distilled water should be added. This service
must be done when the engine is cold. Ask your Polaris dealer to
check the coolant when he performs the fall tune-up on your
snowmobile.