Cooling Fan Thermo Switch - Sym MAXSYM 400i Service Manual

17. Electrical System

Cooling Fan Thermo Switch

The thermo switch mounted on the radiator
controls the operation of the cooling fan motor.
In case that the fan motor fails working, disconnect
the green and black/blue leads, and connect jump
wires to the terminals, then turn on the main
switch. The fan motor should operate afterwards.
If the fan motor still fails running, measure the
battery voltage between the green and black / blue
leads.
If there is no voltage, check for blown fuse, loose
connection or short-circuit.
If the fan motor runs, check the thermo switch in
the manner as described below:
Hang the thermo switch on the bowl filled with
coolant to check the switch's opening and closing
temperatures. To confirm the switch is
close-circuited at room temperature. Increase the
coolant temperature gradually, and the switch
should have a continuity at 95-101℃.
Caution
Keep the coolant at a constant temperature at
least for three minutes. Suddenly increase the
coolant temperature will give rise to wrong
readings of thermometer and the tester to
indicate wrong readings.
Never let the thermometer and the thermo
switch contact the wall of the bowl, which may
result in wrong readings.
The thermo switch shall be placed in the
coolant until the teeth are completely
submerged.
17-20
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Thermometer
Thermo switch
Thermo switch