Cadillac STS fans not activating automatically, seeking assistance to identify issue on Cadillac STS

Some Cadillac STS owners report experiencing issues with their radiator fans not activating automatically, which can be attributed to several potential causes. Common problems include failures in the fan assembly, fan clutch, or coolant temperature sensor, all of which are essential for proper fan operation. Additionally, some owners find that using a scan tool to retrieve fault codes related to the cooling system can provide insights into specific issues. It's also important to check the fuse for the radiator fan, as a blown fuse could indicate underlying wiring issues that may prevent fan activation. Furthermore, problems with coolant temperature and refrigerant pressure can affect the fans' automatic operation, as these parameters are controlled by the PCM. In some cases, the issue may reside within the AC control circuit rather than the fans themselves. Owners may also test the coolant temperature sensor by disconnecting it to see if the fans run at high speed, which could suggest a faulty sensor that needs replacement. If these issues persist, seeking assistance from a professional mechanic or dealership is recommended.