12. COOLING SYSTEM ATV 300/250 Thermostat Bolts Air Vent Tube THERMOSTAT THERMOSTAT REMOVAL Drain the coolant. (page 3-20) Disconnect the thermosensor wire from the thermosensor. Disconnect the water hose from the thermostat housing. Disconnect the air vent tube from the thermostat housing. Remove the mounting bolt and the thermostat housing from the cylinder head. Water Hose Bolts Remove the two screws and separate the thermostat housing halves. Thermostat Thermostat Remove the thermostat from the thermostat housing. 12-11