You can also utilize an OBD2 scanner to check the onboard computer for any error codes. This can provide guidance on any problems the fans might be experiencing. There are many affordable OBD2 scan tools available, some priced around $20-$30. I will include a link below if you need one. Additionally, many auto parts stores offer free scanning services. If there is an issue with the vehicle, it is likely that an error code will be present in the onboard computer, which can help identify the problem.

Another method to determine if a radiator cooling fan has failed is to observe its operation at low speeds. These fans are primarily effective when the vehicle is traveling at less than 20 to 30 miles per hour, as the natural airflow at higher speeds cools the radiator fluid. If the vehicle does not overheat while driving at highway speeds but begins to overheat during city driving, stop-and-go traffic, or when stuck in a traffic jam, this commonly indicates a malfunctioning cooling fan