2007 Arctic Cat Four-Stroke Factory Service Manual, Page 132Get this manual
! NOTE: The thermostat is of the lock-open typeIf the thermostat is ever allowed to fully open, it will remain open and replacement will be necessary ! NOTE: Mix coolant for temperature of -36C (-33F)Follow mixing recommendations of the manufacturer of the coolant
Liquid Cooling System (1100 cc Z1)
The liquid cooling system consists of heat exchanger, water pump, and thermostatThe system should be inspected for leaks or damage whenever an overheating problem is experiencedDRAINING COOLING SYSTEM
3Loosen the coolant bleed screw located between the exhaust ports of the cylinder head; then with no more visible signs of air, tighten the bleed screw4Install the coolant tank cap; then start the engineRun the engine at 3000-3500 RPM for five minutes or until the bottom heat exchangers become hot to the touchStop the engine and allow the system to cool5Lower the front of the snowmobile6Check the coolant levelAdd 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! NOTE: It may be necessary to apply small amount of pressure to the system with pressure tester to help purge air from the system