Subaru 2009 IMPREZA Service Manual page 352

Hide thumbs Also See for 2009 IMPREZA:

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 valve lift.

• Hold the thermostat with a wire or the like to

avoid contacting the container.

Starting temperature to open:

80 — 84°C (176 — 183°F)

Full open temperature:

95°C (203°F)

Total valve lift:

9.0 mm (0.354 in) or more

(A) Thermometer

(B) Thermostat