2000 Arctic Cat ATV Factory Service Manual, Page 206Get this manual

2000 Arctic Cat ATV Factory Service Manual, Page 206

3Remove the clamps securing the upper coolant hose to the thermostat housing and to the radiator; then remove the upper hoseFig4-85
operationASuspend the thermostat in container filled with waterBHeat the water and monitor the temperature with thermometerCThe
thermostat should start to open at 48.5-51.5C (119.3-124F)DIf the thermostat does not open, it must be replaced REMOVING
HOSESTHERMOSTAT 1Drain the coolant from the cooling system2Remove the hose clamps securing the lower coolant hose to the
water pump housing and to the radiator; then remove the lower hoseFig4-84 3Inspect all coolant hoses, connections, and clamps
for deterioration, cracks, and wearNOTE: All coolant hoses and clamps should be replaced every four years or 4000 milesINSTALLING