In many heavy-duty diesel applications, radiator fans can consume significant engine power when running continuously at full speed – even when maximum cooling is not required.

This is where viscous fan clutches play an important role.

How Cojali viscous fan clutches improve diesel efficiency

The fan assembly shown here uses a Cojali bimetal viscous clutch, which automatically engages the fan only when additional cooling is needed. A temperature-sensitive bimetal strip reacts to radiator heat, progressively increasing fan speed as cooling demand rises.

When temperatures reduce, the fan slows down again, reducing unnecessary engine load and helping improve fuel efficiency.

Smarter thermal management for lower fleet operating costs

For demanding applications such as heavy-duty vehicles, mechanically controlled bimetal clutches remain a highly effective solution because they are robust and reliable under harsh operating conditions and lower in complexity than electronically controlled systems used in high-vibration environments.

By reducing unnecessary fan operation, systems like these help lower parasitic engine losses while maintaining reliable cooling performance under load. This helps reduce diesel consumption while improving overall thermal efficiency.

Bristled fan blades improve cooling efficiency even further

The fan assembly also features bristled blade technology that improves tip sealing between the fan and cowling, helping reduce airflow losses and improve cooling efficiency even further.

As operating costs continue to rise, intelligent mechanical cooling solutions continue to prove their value in real-world heavy-duty applications.