2010 Polaris Sportsman 850 Service Manual, Page 98Get this manual

2010 Polaris Sportsman 850 Service Manual, Page 98

COOLING SYSTEM THERMOSTAT Removal (Engine Installed) 123Drain coolant so the coolant level is below the thermostat housing
Housing 4Remove the (2) screws and lift the housing up far enough to remove the thermostat with the coolant line still attached
Water pump failure Loose impeller Engine Coolant Temperature Sensor failure Cooling fan inoperative or turning too slowly
(perform current draw test) Low oil level Spark plug incorrect heat range Faulty hot lamp circuit Thermostat stuck closed
or not opening completely Temperature Too Low Thermostat stuck open Installation 1Install the thermostat, thermostat cover,
and the (2) screwsTorque screws to specification 89 inlbs(10 Nm) Leak at Water Pump Weep Hole Faulty water pump mechanical
seal Worn pump shaft or pump shaft bearing Thermostat Housing Screws: 89 inlbs(10 Nm) 2If servicing while the engine is in