Caliso 21011 Non-Thermal Engine Cooling Fan Clutch

The Caliso 21011 is a non-thermal engine cooling fan clutch designed as a direct replacement for vehicles originally equipped with a non-thermal style clutch. Unlike thermal fan clutches, a non-thermal fan clutch engages based on engine RPM rather than temperature, using internal friction components to regulate fan speed in proportion to water pump shaft speed.

Non-thermal fan clutches are always engaged and typically spin at approximately 30–60% of water pump speed, delivering a consistent flow of cooling air across the radiator at all times. The smooth steel faceplate — with no bimetal thermostatic coil or thermal spring assembly — is the identifying characteristic of a non-thermal design.

Key Features:

• Non-thermal (torque-limiting) design — always engaged for continuous cooling airflow
• Fan speed governed by engine RPM, not coolant or air temperature
• Smooth steel faceplate with no thermal spring assembly
• Direct OE-replacement design for non-thermal fan clutch applications
• Economical replacement option for compatible applications

When replacing a fan clutch, always match the replacement type (thermal or non-thermal) to the original equipment specification. The Caliso 21011 is intended for use in vehicles originally equipped with a non-thermal fan clutch.