What should be inspected under the thermostatic cooling fan category?

• A. Hydraulic and electronic fan systems
• B. Inspect fuel lines
• C. Inspect spark plugs
• D. Inspect belts

Answer: (A)

Thermostatic cooling fan inspection targets the components that actually drive and control the radiator fan. This category covers systems that activate the fan based on temperature, specifically the hydraulic fan drive and the electronic (electric) fan drive. When inspecting, focus on the parts that make the fan operate: for a hydraulic fan, look for leaks, proper fluid level and condition, and the integrity of lines and connections; for an electric fan, check the fan motor, wiring and connectors, the temperature sensor or thermostat that signals the fan, and the control module, relays, and fuses. Also assess the overall condition of the fan blades and ensure the fan engages and suspends correctly when commanded.

Fuel lines, spark plugs, and belts relate to other subsystems or components and are not the primary focus when evaluating the thermostatic cooling fan operation.