2003-2006 Kawasaki KFX400 service manual, Page 163Get this manual
COOLING AND LUBRICATION SYSTEM
COOLING FAN THERMO-SWITCH
The cooling fan is secured behind the radiator by three bolts and is automatically controlled by the thermoswitchThe thermo-switch remains open when the temperature of the engine coolant is low, but closes when the temperature reaches approximately 88C (190F) setting the cooling fan in motion