2003 2005 YFM45FAR, YFM450FAR Kodiak OEM Service Manual, Page 367Get this manual
SIGNAL SYSTEM
3.If the coolant temperature warning light does not come on: Check that the light comes on when the main switch is set to "ON"G Check that the light comes on when the coolant temperature is 120 (248 5.4 F) or higher and that the light remains on when the coolant temperature drops to 113 (235.4 F)1.Thermo switch 1
Remove the thermo switch from the cylinder headConnect the pocket tester1) to the thermo switch 1Immerse the thermo switch in coolant 2Check the thermo switch for continuityWhile heating the coolant use thermometer to record the temperaturesTest step