ASVAB Practice Test

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Coolant flow through an engine is regulated by the?

  1. fan

  2. filter

  3. pump

  4. thermostat

The correct answer is: thermostat

The fan, filter, and pump may all play a role in the functioning of an engine, but they are not directly responsible for regulating coolant flow. The fan helps with air circulation to keep the engine cool, the filter removes impurities from the coolant, and the pump helps circulate the coolant. The thermostat, however, is responsible for regulating the flow of coolant by opening and closing to maintain the optimal temperature for the engine. Therefore, the thermostat is the correct answer for this question.

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