Subaru 2009 IMPREZA Service Manual page 1199

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C: INSPECTION

Replace the thermostat if the valve does not close

completely at an ambient temperature or if the fol-

lowing test shows unsatisfactory results.

• Inspection method

Immerse the thermostat and a thermometer in wa-

ter. Raise water temperature gradually, and mea-

sure the temperature and valve lift when the valve

begins to open and when the valve is fully opened.

During the test, agitate the water for even temper-

ature distribution. The measured value should

meet the specification.

• Leave the thermostat in the boiling water for

five minutes or more before measuring the valve

• Hold the thermostat with a wire or the like to

avoid contacting the container.

Starting temperature to open:

76 — 80°C (169 — 176°F)

Full open temperature:

91°C (196°F)

Total valve lift:

9.0 mm (0.354 in) or more

(A) Thermometer

(B) Thermostat

CO(H4DOTC)-19