Are both fans supposed to run at the same time on a 2002 olds silhouette?

Yes, both cooling fans on a 2002 Oldsmobile Silhouette are designed to run at the same time under certain conditions, such as when the engine reaches a specific temperature or when the air conditioning system is engaged. The fans work together to help maintain optimal engine temperature and provide adequate airflow through the radiator. If one fan is not operating, it can lead to overheating or reduced cooling efficiency. Always check the fuses, relays, and wiring if there are issues with the fans.