Yamaha Royal Star Tour Deluxe XVZ13CTTC Supplementary Service Manual page 63

EAS00809
4. Radiator fan motor
• Disconnect the radiator fan motor coupler
from the wire harness.
• Connect the battery (DC 12 V) as shown.
Positive battery lead → blue 1
Negative battery lead → black 2
• Does the radiator fan motor turn?
YES
EAS00811
5. Thermo switch 3
• Remove the thermo switch 3 from the radi-
ator.
• Connect the pocket tester (Ω × 1) to the
thermo switch 3 1 as shown.
• Immerse the thermo switch 3 in a con-
tainer filled with coolant 2.
• Place a thermometer 3 in the coolant.
• Slowly heat the coolant, and then let it cool
down to the specified temperature.
• Check the thermo switch 3 for continuity at
the temperatures indicated below.
NO
The radiator fan
motor is faulty and
must be replaced.
– 56 –
COOLING SYSTEM
Coolant temperature
Test
step
Thermo switch 3
Less than 105 ± 3 °C
1
(221 ± 5.4 °F)
More than 105 ± 3 °C
2
(221 ± 5.4 °F)
More than 100 ± 3 °C
3
(212 ± 5.4 °F)
Less than 100 ± 3 °C
4
(212 ± 5.4 °F)
Steps 1 & 2: Heating phase
Steps 3 & 4: Cooling phase
WARNING
• Handle the thermo switch 3 with special
care.
• Never subject the thermo switch 3 to
strong shocks. If the thermo switch 3 is
dropped, replace it.
Thermo switch 3
28 Nm (2.8 m · kg, 20 ft · lb)
• When the thermo switch 3 circuit is open,
the radiator fan should be off.
• When the thermo switch 3 circuit is closed,
the radiator fan should be on.
• Does the thermo switch 3 operate properly
as described above?
• Does the radiator fan motor turn?
YES
– +
ELEC
Continu-
ity
NO
YES
YES
NO
NO
Replace the thermo
switch 3.