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4-20 COOLING SYSTEM
Thermostat
•
To check valve opening temperature, suspend the ther-
mostat [A] in a container of water and raise the tempera-
ture of the water.
○
The thermostat must be completely submerged and must
not touch the container sides or bottom. Suspend an ac-
curate thermometer [B] in the water so that the heat sen-
sitive portions [C] are located in almost the same depth.
It must not touch the container, either.
If the measurement is out of the specified range, replace
the thermostat with a new one.
Thermostat Valve Opening Temperature
58 ∼ 62°C (136 ∼ 144°F)
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