Thermo Switch - Sym Joyride 125 Service Manual

Thermo Switch

The thermo switch mounted on the radiator
controls the operation of the cooling fan motor.
In case that the fan motor fails to work,
disconnect the green and black/blue leads
and connect jump wires to the terminals. Turn
on the switch and check if the fan motor
operates.
If the fan motor fails to run, 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, confirm the switch is
open circuited at room temperature. Increase
the coolant temperature gradually. The switch
should have a continuity at 98-102℃.
Caution
Keep the coolant at a constant
temperature at least for three minutes.
Sudden increase the coolant temperature
will cause the thermometer and the
thermo switch 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.
To this chapter contents
Thermometer
18. Electrical System
Thermo switch
Thermo switch
18-21