Caliso 22308 Heavy Duty Thermal Engine Cooling Fan Clutch

The Caliso 22308 is a heavy duty thermal engine cooling fan clutch engineered as a direct-fit replacement for select passenger vehicles. This fan clutch bolts directly between the water pump and the engine cooling fan, automatically engaging and disengaging the fan based on underhood temperatures to maintain optimal engine cooling.

Thermal fan clutches operate via a silicone-based fluid and a bimetallic thermal spring. As hot air passes across the radiator, the spring deflects, opening internal valve ports that allow fluid into the working chamber and engaging the fan. Once the engine reaches a safe operating temperature, the spring closes the ports and the fan disengages, reducing parasitic load on the engine and improving fuel efficiency.

The heavy duty designation means this clutch is designed for deeper-pitch fans and delivers increased cooling capacity compared to standard duty units, turning the fan at up to 70–90% of shaft speed when fully engaged.

Key Features:

• Heavy duty thermal design for increased cooling performance
• Direct bolt-on replacement — no modifications required
• Meets or exceeds OEM specifications for fit, form, and function
• Compatible with OEM Mercedes-Benz reference number 111-200-04-22 (1112000422)
• Engineered for use with deeper-pitch fans (2½" of pitch)
• Automatic temperature-sensitive engagement and disengagement
• Reduces engine load and improves fuel economy when cooling demand is low

The Caliso 22308 is a reliable, cost-effective solution for restoring proper engine cooling system function and preventing overheating.