Caliso 22634 Thermal Truck Drive Fan Clutch Engine Cooling

The Caliso 22634 is a thermal truck drive fan clutch designed as a direct-fit replacement for the engine cooling system. This fan clutch uses a thermally activated silicone fluid coupling to automatically regulate cooling fan speed based on engine temperature, helping maintain optimal operating temperatures while reducing unnecessary parasitic drag on the engine.

How It Works:

A bimetallic spring responds to underhood air temperature, opening a valve that allows silicone fluid to flow from an internal reservoir into the working chamber. As engine temperatures rise, the clutch engages and spins the cooling fan at a higher rate to draw more airflow through the radiator. When temperatures drop, the fluid returns to the reservoir and the fan speed decreases, conserving engine power and improving fuel efficiency.

Key Features:

• CNC machined to exact OE specifications for precise fit and performance
• All-aluminum body construction for efficient heat dissipation and reduced weight
• Heavy-duty bearing with high-temperature moly grease for long service life
• Thermal (temperature-responsive) engagement design
• 100% new construction — not remanufactured
• General application coverage with clutch specifications and industry interchange information printed on the label

The Caliso 22634 thermal fan clutch is a reliable, direct-replacement cooling component engineered to restore proper engine temperature management and protect against overheating.