Polaris 800 Pro X - Manual (Page 90)

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MAINTENANCE
Engine Cooling - Liquid Cooled Models
Bleeding the Cooling System
If coolant becomes low in the tank, bleed the system of trapped air
using the following procedure:
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. NOTE: 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. NOTE: 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
outlined in step 3. NOTE: 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. NOTE: After cooldown, three (3) or
more ounces 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.
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.
CAUTION