How would you test a faulty cooling fan or fan control module, and what would be typical failure signs?

• A. Observe the fan with the engine off to see if it spins.
• B. Replace the entire cooling system without testing.
• C. Test only by thermostat temperature.
• D. Check fuse and relay, verify power to the fan, run a direct power test, and monitor activation via scan tool.

Answer: (D)