Yamaha 2012 Grizzly 300 Service Manual page 298

EBS01086
4. Radiator fan motor
• Disconnect the radiator fan motor coupler
from the wire harness.
Connect the battery (DC 12 V) as shown.
•
Positive tester probe → deep blue
Negative tester probe → black/blue
2
B/L DL
DL B/L
• Does the radiator fan motor turn?
YES
5. Circuit breaker (fan motor)
• Remove the circuit breaker from the wire
harness.
• Connect the pocket tester (Ω × 1) to the
circuit breaker.
Circuit breaker resistance
Zero Ω at 20 °C (68 °F)
YES
1
2
1
12V
NO
The radiator fan motor
is faulty and must be
repaired.
NO
Replace the circuit
breaker.
9-31
COOLING SYSTEM
EBS01088
6. Thermo switch
• Remove the thermo switch from the radi-
ator.
• Connect the pocket tester (Ω × 1) to the
thermo switch as shown.
1
• Immerse the thermo switch in a container
filled with coolant 2.
• Place a thermometer
• 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
Less than 98 ± 3°C
1
(208.4 ± 5.4 °F)
More than 98 ± 3 °C
2
(208.4 ± 5.4 °F)
More than 92 ± 3 °C
3*
(197.6 ± 5.4 °F)
Less than 92 ± 3 °C.
4*
(197.6 ± 5.4 °F)
Steps 1 & 2: Heating phase
Steps 3* & 4*: Cooling phase
ELEC
– +
in the coolant.
3
ity
NO
YES
YES
NO