2008 Arctic Cat DVX 400 ATV Service Manual, Page 89Get this manual
Coolant Temperature and Cooling Fan Switches 1Connect the meter leads (selector in the OHMS position) to the switch contacts2Suspend the switch and thermometer in container of oil; then heat the oilNOTE: Neither the switch nor the thermometer should be allowed to touch the bottom of the container or inaccurate readings will occurUse wire holders to suspend switch and thermometer
Fan Motor
NOTE: The ignition switch must be in the ON position
VOLTAGE (Main Harness Connector to Fan Motor) 1Set the meter selector to the DC Voltage position2Connect the red tester lead to the orange wire (the black 2-prong at the fan motor); then connect the black tester lead to ground3The meter must show battery voltageNOTE: If the meter shows no battery voltage, troubleshoot the battery, fuse, motor, or the main wiring harnessNOTE: If the meter shows battery voltage, the main wiring harness is goodThe connector should be tested for resistanceNOTE: To determine if the fan motor is good, connect the red wire from the fan connector to 12 volt DC power supply; then connect the blackred wire from the fan connector to groundThe fan should operate