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12. COOLING SYSTEM
Trouble Diagnosis for Cooling System
The temperature indicated is too high
Y
A. Stop and waiting for the
engine is completely
N
cooled down, open cap to
check the capacity of
coolant in radiator.
Y
A1.Refill the radiator with
coolant then check for any
leakage?
N
Y
Water leaking problem
B. Turn on main switch and
N
check the water
temperature indicator
back to zero?
Y
B-1. Measure thermo unit to
confirm voltage 6V
↑
?
Y
B-2. Inspect the circuits of
water temperature have
short or earth?
N
Replace thermo unit
Y
Short or earth handle
N
Meter problem
C. Open radiator cap and
N
softly throttle, inspect
coolant have circulated?
Y
C-1. Eng. stop and remove
water pump cover, start the
motor to inspect pump
its rotation?
Y
Water pump repair
Water hose clogged
D. Close radiator cap,
measure thermo unit to
N
confirm voltage reduced
comply with temperature
rise?
Replace thermo unit
Y
Next page
12-3
N
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