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Service Manual Mitsubishi SL-Series diesel engines
Version 08/2004
INSPECTION
ENGLISH
COOLING SYSTEM
35.3 Thermoswitch (standard)
Hang the thermoswitch in the pan of oil with its
temperature sensing end below the surface of oil and
measure the resistance while heating the oil as shown
in the illustration. If the resistance is incorrect, replace
the thermoswitch.
35.4 Thermounit (standard)
Hang the thermounit in the pan of antifreeze with its
temperature sensing end below the surface of
antifreeze and measure the resistance while heating
the antifreeze as shown in the illustration. If the
resistance is incorrect, replace the thermounit.
Figure 208 Testing thermoswitch
Resistance at 120°C
(248°F)
30 mΩ
Temperature at which switch
is turned ON
111 ± 3.5°C
(232 ± 6.3°F)
WARNING
Oil in the pan is hot. Any contact can cause severe
burns.
Figure 209 Testing thermounit
Standard 50°C (122°F): 80 ± 10 Ω
80°C (176°F): 29.5 ± 2.5 Ω
120°C (248°F): 10 ± 0.3 Ω
WARNING
Antifreeze in the pan is hot. Any contact can cause
severe burns.
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