Cooling System Schematic - Arctic Cat ZR4000 Service Manual

XM213
3. Remove all springs securing the expansion chamber;
then with the expansion chamber removed, loosen
the clamp securing the lower coolant hose behind the
engine. Remove as much coolant as possible using
the coolant vacuum pump.
XM209A
NOTE: Raising the rear end of the snowmobile will

aid in removing all coolant from the heat exchangers.
4. Once the coolant has completely drained, secure the
lower coolant hose using the existing clamp.
FILLING COOLING SYSTEM
1. Elevate the front of the snowmobile 30-35 cm (12-14
in.).
2. Remove the coolant tank cap and check coolant
level. The coolant tank should be filled to the coolant
level line.
3. Install the coolant tank cap; then start the engine.
Run the engine at 3000-3500 RPM until the bottom
heat exchangers become hot to the touch. Stop the
engine and allow the system to cool.
4. Lower the front of the snowmobile and elevate the
rear of the snowmobile 12-14 in. Repeat the proce-
dures in step 3.
5. Check the coolant level. Add coolant as required to
the coolant tank (coolant tank should be filled to
coolant level line). Repeat procedure until coolant
level stabilizes in the coolant tank.
CAUTION
The cooling system must be properly filled. If the sys-
tem isn't properly filled, piston damage will occur.
116
NOTE: If coolant is required, mix coolant for a tem-

perature of -36°C (-34°F). Follow mixing recommen-
dations of the manufacturer of the coolant.
INSPECTING COOLANT HOSES AND
CLAMPS
All coolant hoses and connections should be checked
annually for deterioration, cracks, and wear.
All coolant hoses and clamps should be replaced every
four years.
INSPECTING THERMOSTAT
1. Inspect the thermostat for corrosion, wear, or spring
damage.
2. Using the following procedure, inspect the thermo-
stat for proper operation.
a. Suspend the thermostat in a container filled with
water; then heat the water and monitor the tempera-
ture with a thermometer.
b. The thermostat should open at 30°C (86°F). Once the
thermostat starts to open, remove the thermostat and
allow it to cool down verifying it has returned to the
fully closed position
CAUTION
Never heat the thermostat to the fully open position or
damage to the thermostat may occur.

Cooling System Schematic

The following schematic is representative of the different
styles of cooling systems in the Arctic Cat snowmobiles.
Some components may vary from model to model; there-
fore, the technician should use discretion and sound judg-
ment when servicing a particular cooling system.
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