Operation CHARM
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Subaru
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2003
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Impreza F4-2.5L SOHC
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Repair and Diagnosis
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Engine, Cooling and Exhaust
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Cooling System
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Description and Operation
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Thermostat
Thermostat
Thermostat
The thermostat has a totally-enclosed wax pellet which expands as the coolant temperature increases. It opens and closes accurately at the preset temperatures and features high durability.