16-44 ELECTRICAL SYSTEM
Switches
Radiator Fan Switch Inspection
•
Remove:
Radiator Fan Switch (see Cooling System chapter)
•
Suspend the fan switch [A] in a c ontainer of coolant so that
the temperature sensing projection and threaded portion
are s ubmerged.
•
Suspend an accurate thermometer [B] in the coolant, so
that the sensitive portions [C] are located in almost the
same depth.
NOTE
○
The switch and thermometer must not touch the con-
tainer sides or bottom.
•
Place the container over a source of heat and gradu-
ally raise the temperature of the coolant while stirring the
coolant gently.
•
Using the hand tester, measure the internal resistance
of the s witch across the terminals a t the temperatures
shown in the table.
If the hand tester does not show the specified values, re-
place the switch.
Radiator Fan Switch Resistance
Rising temperature:
FromOFFtoONat86∼ 90 °C (187 ∼ 194°F)
Falling temperat ure:
From ON to OFF a t 81 ∼ 85°C (178 ∼ 185°F)
ON: Less than 0.5 Ω
OFF: More than 1 MΩ
•
Repeat the above steps for the other fan switch.
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