Mercedes-Benz E430 engine cooling fan not activating on Mercedes-Benz E430

Some Mercedes-Benz E430 owners report experiencing issues with the engine cooling fan not activating, which can stem from problems with the fan assembly, fan clutch, or coolant temperature sensor. Symptoms such as the cooling fan failing to engage when starting the car cold may indicate deeper issues within the fan system. In certain cases, owners find that the electric radiator fans do not spin at all, leading to overheating when the vehicle is idle or driven for extended periods. Additionally, some owners may need to check the cycle module to monitor aux fan activation points based on engine coolant temperature and refrigerant pressure thresholds. It is important to note that the auxiliary fan should only activate under specific conditions, such as very high engine coolant or refrigerant temperatures, and should not run continuously during normal operation. For those facing these issues, inspecting the relevant components and monitoring activation points is crucial for effective diagnosis and resolution.