Technician A says that the cooling system thermostat serves only to measure engine operating temperature. Technician B says that the thermostat regulates the flow of coolant through the engine and cooling system, which in turn regulates the temperature of the coolant in the engine. Who is correct?

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1. Technician A says that the cooling system thermostat serves only to measure engine operating temperature. Technician B says that the thermostat regulates the flow of coolant through the engine and cooling system, which in turn regulates the temperature of the coolant in the engine. Who is correct?