Service Manual — page 248 of 715

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4-22 COOLING SYSTEM
Thermostat
Thermostat Inspection
• Remove    the thermostat (see Thermostat Removal).
• Inspect  the thermostat valve [A] at room temperature.
  If the valve is open, replace the thermostat with a new
 one.

• 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
   Standard: 58 ∼ 62°C (136 ∼ 144°F)