2005 Polaris Sportsman 700/800 EFI Service Manual, Page 270Get this manual
ELECTRICAL
COOLANT TEMPERATURE SENSOR
The coolant temperature sensor can be tested using an ohmeter or voltmeter1With the engine and temperature sensor at room temperature (6820 C), disconnect the harness connector2With the meter in the ohms mode, place the meter leads onto the sensor contactsOne lead on Yellow wire and one lead on the Violet wire3Use the table TemperatureResistance table to determine if the sensor needs to be replaced
2With the ATV in "Park" and with the parking brake on, turn the ignition key (and engine stop switch) "ON"The fan should start running3If the fan does not run or runs slowly, check the fan motor wiring, ground, motor condition and mechanical relay for proper operation (refer to 'Fan Motor Current Draw' this section)Repair or replace as necessaryIf the fan runs with the sensor harness disconnected, but will not turn on when the engine is hot, check the coolant temperature sensor and connector terminals
FAN MOTOR CURRENT DRAW
A current draw test will provide good indication of fan motor conditionA worn or damaged fan motor will draw more current, which causes reduction in blade speed and reduced coolingFan Motor