Yamaha VMX12 2001 Service Manual page 437

• Does the radiator fan motor turn?
YES
EAS00811
5. Thermo switch
• Remove the thermo switch from the con-
duit.
• Connect the pocket tester (Ω × 1) to the
thermo switch 1 as shown.
• Immerse the thermo switch in a container
filled with coolant 2.
• Place a thermometer 3 in the coolant.
• Slowly heat the coolant, then let it cool
down to the specified temperature.
• Check the thermo switch for continuity at
the temperatures indicated below.
Coolant temperature Continu-
Test step
Thermo switch
0 ~ 105 ± 3 °C
1
More than
2
102 ~ 108 °C
3* 108 to 98 °C
4* Less than 98 °C
Steps 1 & 2: Heating phase
Steps 3* & 4*: Cooling phase
WARNING
@
• Handle the thermo switch with special
care.
• Never subject the thermo switch to
strong shocks. If the thermo switch is
dropped, replace it.
Thermo switch
15 Nm (1.5 m • kg)
Three bond sealock
NO
The radiator fan
motor is faulty and
must be replaced.
ity
NO
YES
YES
NO
®
10
COOLING SYSTEM
È The thermo switch circuit is open and the radia-
tor fan is off.
É The thermo switch circuit is closed and the
radiator fan is on.
• Does the thermo switch operate properly as
described above?
8 - 45
ELEC
YES
Replace the thermo
switch.
– +
NO