Viscous Fan Clutch for Engine Cooling 🔧

This fluid-driven coupling controls the radiator fan to keep your Toyota engine in the safe zone. It engages when hot and freewheels when cool, cutting heat, noise, and fuel use. Perfect for daily driving, towing, sand, and mountain climbs. 🌡️🛡️

Why the part is needed

Stable coolant temperature protects the head gasket, hoses, and transmission cooler. A healthy clutch delivers strong airflow at idle, better A/C at lights, and protects the radiator and water pump from overload. Great OEM-grade replacement for aging fan drives.

How it works

Inside is silicone oil and a thermal bimetal spring. As air off the radiator heats the spring, a valve opens and increases oil shear, locking the fan housing to the hub so the blades spin faster. When temps drop, the valve closes and the fan slips to save power. ❄️

What happens if it’s broken

Freewheeling unit: overheat in traffic, weak A/C, boilover, warped head, blown gasket. Seized unit: constant roar, poor MPG, slow warm‑up, belt and bearing stress. Look for wobble, leaks, burnt smell, or oily dust near the clutch. ⚠️

Install and care tips

Thread to the pump by hand, torque to spec, keep the shroud centered, never pry on fins, and check belt tension. Verify coolant level and thermostat after install. 🚙

Compatibility

• 4Runner
• Coaster
• Fj Cruiser
• Grnva/Hiace/Mjsty
• Land Cruiser
• Land Cruiser Prado
• Tacoma
• Tundra