California Air Tools 3010 Service Manual Page 474

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17-54 ELECTRICAL SYSTEM
Switches and Sensors
Brake Light Switch Inspection
Refer to the Brake Light Switch Inspection in the Periodic
Maintenance chapter.
Radiator Fan Switch Inspection
Remove the radiator fan switch (see Radiator Fan Switch
Removal in the Cooling System chapter).
Suspend the fan switch [A] in a container of coolant so that
the temperature sensing projection and threaded portion
are submerged.
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 m ust 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 switch across the terminals at the temperatures
shown in the table.
Special Tool - Hand Tester: 57001-1394
If the hand tester does not show the specified values, re-
place the switch.
Radiator Fan Switch Resistance
Rising Temperature:
From OFF to ON at 86 90°C (187 194°F)
Falling Temperature:
From ON to OFF at 81 85°C (178 185°F)
ON: Less than 0.5
OFF: More than 1 M
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