Caliso 22605 Thermal Truck Drive Fan Clutch

The Caliso 22605 is a thermal truck drive fan clutch engineered as a direct-fit replacement for heavy-duty truck applications. This unit uses temperature-sensitive silicone fluid and a bi-metallic spring assembly to automatically engage and disengage the cooling fan based on engine operating temperature, delivering effective thermal management without unnecessary parasitic drag on the engine.

When the engine reaches elevated temperatures, the clutch engages to drive the fan at a higher percentage of shaft speed, pulling maximum airflow through the radiator. As temperatures stabilize, the clutch partially disengages, allowing the fan to spin more freely — reducing engine load, improving fuel efficiency, and lowering fan noise.

Key Features:

• Thermal engagement design responds automatically to engine temperature
• Meets or exceeds OEM fit, form, and function specifications
• Direct bolt-on installation for a straightforward replacement
• Heavy-duty construction built to withstand demanding truck operating conditions
• Helps prevent engine overheating while minimizing unnecessary power draw
• Compatible with applicable GM and heavy-duty truck platforms

Replacing a worn or failed fan clutch with the Caliso 22605 helps restore proper cooling system performance, prevent overheating, and protect against the fuel economy loss and excessive noise caused by a stuck or slipping clutch.