310T Engine and Supporting Systems Practice Exam 2026 – The Comprehensive All-in-One Guide for Exam Success!

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Which device initiates radiator fan operation based on engine coolant temperature without ECU input?

Integrated fan control (ECU)

Thermostat switch

The thermostat switch is a temperature-activated device placed in the cooling system that closes a circuit when coolant reaches a set temperature. Once it closes, it powers the radiator fan without any input from the ECU, so the fan starts based solely on heat. This mechanical/thermal signal provides automatic cooling even if the engine computer isn’t involved. In contrast, ECU-controlled fans rely on electronic signals from sensors, and manual or passenger-controlled options require user action.

Passenger-assisted control

Manual dash switch

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