Polaris 600 IQ Racer Owner's Manual page 78

MAINTENANCE
Cooling System
Bleeding the Cooling System
NOTICE: If coolant flow becomes restricted or plugged, coolant loss, air lock or
engine damage may result. Most cooling systems are equipped with a
filter that should be periodically inspected or replaced.
If coolant becomes low in the tank, bleed the system of trapped air. Per-
form the bleeding procedure when the engine is cold.
1. Allow the system to cool completely, then loosen the bleed screw
and fill the reservoir to the FULL COLD mark. Tighten the screw.
2. Apply the parking brake and run the engine at idle RPM until the
thermostat opens (5 to 8 minutes) and stays open.
TIP: As the thermostat draws in cold coolant from the heat exchangers, the cold
coolant may close the thermostat. Make sure it opens and stays open.
3. Tip the snowmobile slightly onto its right side. Cycle the RPM from
idle to enough RPM (4000) to get coolant to flow, but not enough to
engage the clutch. This allows air to bleed from the rear crossover
tube.
TIP: There must be enough coolant flow to purge the air from the crossover
hose or rear cooler so you can observe this air reaching the bottle.
4. Tilt the machine slightly onto its left side so that the coolant bottle
is the highest point in the cooling system. Cycle the RPM as out-
lined in step 3.
TIP: There must be enough coolant flow to purge the air from the front close-off
cooler so you can observe the air reaching the bottle.
5. Return the snowmobile to its upright position and loosen the bleed
screw at the top of the water outlet manifold. When all trapped air
has been purged, tighten the screw.
6. Turn off the engine and release the parking brake. Allow the system
to cool completely.
TIP: After cool-down, three or more ounces (88 ml) of coolant may have to be
added.
7. Remove the pressure cap and check the coolant level. Add coolant
to the fill line if necessary.
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