16-86 ELECTRICAL SYSTEM
Switch and Sensors
Radiator Fan Switch Removal
Never drop the fan switch, especially on a hard sur-
face. Such a shock to the part can damage it.
Drain the coolant (see Cooling System chapter).
Disconnect the fan switch connector.
Unscrew the radiator fan switch [A] from the radiator.
Radiator Fan Switch Installation
Torque - Radiator Fan Switch: 18 N·m (1.8 kgf·m, 13 ft·lb)
Fill the coolant and bleed the air from the cooling system
(see Periodic Maintenance chapter).
Radiator Fan Switch Inspection
Remove the fan switch from the radiator.
Suspend the switch [A] in a container of machine oil so
that the heat-sensitive portion and threaded portion are
Suspend an accurate thermometer [B] with heat-sensitive
portions [C] located in almost the same depth.
The switch and thermometer must not touch the con-
tainer sides or bottom.
Place the container over a source of heat and gradually
raise the temperature of the oil while stirring the oil gently
for even temperature.
Using the hand tester (special tool), measure the internal
resistance of the switch across the terminals at the tem-
peratures shown in the table.
If the measurement is out of the range, replace the switch.
Fan Switch Resistance
From OFF to ON at 102
From ON to OFF at 97
ON: Less than 0.5 Ω
OFF: More than 1 MΩ
Water Temperature Switch Removal
The water temperature switch should never be al-
lowed to fall on a hard surface. Such a shock to the
part can damage it.
Drain the coolant (see Periodic Maintenance chapter).
Disconnect the switch connector.
Remove the water temperature switch [A] from the radia-