Impreza Brighton Coupe AWD F4-2.2L SOHC (1997)
Thermostat: Testing and Inspection
NOTE: Replace the thermostat if the valve does not close completely at an ambient temperature or if the following test shows unsatisfactory results.
Immerse the thermostat and a thermometer in water. Raise water temperature gradually, and measure 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 temperature distribution. The measurement should be to the
specification.
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Starts to open: 76.0 - 80.0°C (169 - 176°F)
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Fully opens: 91°C (196°F)