Fan clutches

Fan clutches

The fan clutch is a coupling device that is located between the water pump shaft and the fan.  It is is designed to improve the vehicle’s cooling system efficiency while reducing the load on the engine and loss of energy caused by the fan itself. 


You will find that most fan clutches are viscous or “fluid” (the internal friction of a fluid that is produced by movement of its molecules against each other. It is what causes the fluid to resist flowing) couplings that are combined with a bi-metallic (it’s a strip that is used to convert a temperature change into mechanical displacement and it usually consists of two layers of iron and copper) sensory system that is similar to that in a thermostat - When the air coming through the radiator is hot, the spring expands and opens an internal valve that reduces clutch slippage. This causes the fan to spin faster for increased cooling. As the air cools, the spring contracts and closes the valve. This increases the amount of clutch slippage, allowing the fan to slow down and decrease cooling.

Fan clutches VeGa are designed to cover:
Improving energy savings
Higher Productivity
Less noise
Improved comfort and safety
When the engine is cool or even at normal operating temperature, the fan clutch partially disengages the engine's mechanically-driven radiator cooling fan, generally located at the front of the water pump and driven by a belt and pulley connected to the engine's crankshaft. This saves power, since the engine does not have to fully drive the fan. However, if engine temperature rises above the clutch's engagement temperature setting, the fan becomes fully engaged, thus drawing a higher volume of ambient air through the vehicle's radiator, which in turn serves to maintain or lower the engine coolant temperature to an acceptable level.

How do you know when your Fan Clutch have to be changed?    


Excessive Free-Wheeling when spun manually (when engine is                     stopped) - With the engine stopped, manually spin the fan. If the Fan           spins excessively, over 3 revolutions, as though there is no resistance         it should be replaced. 
If your air conditioner does not perform well at idle or low vehicle               speeds then the clutch may have failed and air is not passing over the         A/C condenser efficiently enough to cool the refrigerant. 
If the fan speed does not increase when engine is running hot.
Vibration - Sometimes vibration can be detected due to a failed clutch.       The vibration can increase with with engine speed.   Many times this can lead to water pump failure.



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05-01-2015 22:19:17

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