General Studies · Engine Cooling System
What happens to the thermostat valve when the engine reaches its optimum high operating temperature?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 1It directly turns off the radiator cooling fan
- 2It increases the speed of the water pump
- 3It closes completely to block coolant flow to the radiator
- 4It opens to allow coolant flow to the radiator✓
Correct answer
It opens to allow coolant flow to the radiator
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