Subaru Impreza 2003 Service Manual page 342

COOLING
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.
Immerse the thermostat and thermometer in water.
Raise water temperature gradually, and measure
the temperature and valve lift when the valve be-
gins to open and when the valve is fully opened.
During the test, agitate the water for even temper-
ature distribution. The measurement should be to
the specification.
Starts to open:
Model with OBD:
80 — 84 ° ° ° ° C (176 — 183 ° ° ° ° F)
Model without OBD:
76 — 80 ° ° ° ° C (169 — 176 ° ° ° ° F)
Fully opens:
Model with OBD:
95 ° ° ° ° C (203 ° ° ° ° F)
Model without OBD:
91 ° ° ° ° C (196 ° ° ° ° F)
(A) Thermometer
(B) Thermostat
THERMOSTAT
( A )
( B )
CO-00033
CO(H4SO)-20