What are the symptoms of a bad radiator fan relay?

Symptoms of a bad radiator fan relay include the engine overheating, as the fan may not operate when needed. Additionally, you might notice the radiator fan running continuously or not at all, regardless of engine temperature. Other signs can include unusual noises from the fan or electrical issues, such as blown fuses related to the relay. If you experience these symptoms, it's advisable to have the relay inspected and tested.