What is a Fan Clutch?
The Fan Clutch is a vital part of your vehicle emissions control system. Its job is to reduce toxic air by converting harmful pollutants into less harmful emissions, such as water, carbon dioxide and nitrogen.
How Does a Fan Clutch Work?
A conventional fan clutch is viscously operated and relies on sensors to detect temperature. A special kind of oil is contained within its reservoir and allowed to flow out of the reservoir through an aperture when the temperature reaches its trigger point. As the oil goes into the function chamber it activates a shaft that causes the fan to rotate. Conversely, when the temperature reduces past the trigger point, the valve allowing the oil to enter will close and the remaining oil in the chamber will discharge through centrifugal force back to the reservoir. As this happens, the rotor will deactivate and the fan will stop. Without this viscous operation, the fan would be directly connected to the driving belt at all times and would provide cooling when not needed. Electrically operated fan clutches are an alternative and rely on a solenoid controlling a spring-loaded valve.
How Is a Fan Clutch Made?
Fan clutches are produced from high-quality materials meant to withstand vibration and heat. At the front is a bimetallic temperature sensor and beneath the outer cover is a slide valve, chamber, and rotor. The rear side of the case completes the enclosure and mounts to a pulley shaft that is connected to the driving belt.
Why Does a Fan Clutch Fail?
- The clutch will get stuck in the “on” position.
- The clutch will fail to engage.
What Are the Symptoms of Failure?
- Decrease in overall power or fuel efficiency.
- Excessive noise.
- Overheating engine.
What Are the Consequences of Failure?
- Higher costs of operation.
- Engine damage.