TGB Blade 250 ATV Quad Service Repair Manual, Page 213Get this manual
17ELECTRICAL SYSTEM Cooling Fan Thermo Switcl
The thermo switch mounted on the radiator controls the operation of the cooling fan motorIn case that the fan motor fails to work, disconnect the green and blacklblue leads and connect jump wires to the terminals, then, turn on the main switch, the fan motor should operateIf the fan motor still fails to run, measure battery voltage between the green and blacklblue leadsIf there is no voltage, check for blown fuse, loose connection or short-circuitIf the fan motor runs, check the thermo switch in the manner as described below: Hang the thermo switch on the bowl filled with coolant to check the switch's opening and closing temperatures, confirm the switch is open circuited at room temperature, increase the coolant temperature graduallyThe switch should have continuity at 983'C