Otis Singleton
An electric fan clutch is an important component of an automotive cooling system. It is a temperature-controlled coupling between the water pump shaft and the fan, allowing the fan to be operational at low speeds and disconnected at high speeds. This mechanism helps the engine operate more efficiently by removing the load from the fan. Electric fan clutches are controlled by a signal from the vehicle's computer and are designed to keep the engine temperature in check. They are known to limit torque, resulting in reduced horsepower usage.
| Characteristics | Values |
|---|---|
| Purpose | Helps the cooling system operate effectively and the engine operate efficiently |
| Working | A temperature-controlled coupling between the water pump shaft and the fan which allows the fan to be operational at low speeds and disconnected at higher speeds |
| Types | Non-thermal, thermal, and electronic |
| Working of electronic fan clutch | Operates the same way as a thermal clutch, but the valves are controlled by a signal from the vehicle’s computer |
| Engagement | PWM clutch is quick to fully engage, but slower to return to a freewheel state when it is controlled by a simple OFF/ON method |
| Sound | When the clutch reaches the proper temperature and locks, the fan can make a roar sound |
| Speed | Severe Duty Thermal Fan Clutches turn the fan at 80-90% of the water pump speed when engaged |
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What You'll Learn
Fan clutches are a key part of a vehicle's cooling system
The fan clutch helps the cooling system operate effectively and the engine to run efficiently. When the engine gets warm, the fan clutch "grabs", causing the fan to spin faster and create more airflow. This is particularly important when the vehicle is stationary or moving slowly, as the airflow is reduced and the engine can quickly overheat.
There are several types of fan clutches, including non-thermal, thermal, and electronic. All of these use a silicone fluid to engage and disengage the fan. Electronic fan clutches operate in the same way as thermal clutches, but the valves are controlled by a signal from the vehicle's computer. These electronic clutches are designed to work with the vehicle's PCM (Powertrain Control Module) to optimise the fan's performance and reduce power loss.
Fan clutches can also help with the operation of the air conditioning system, particularly in hot conditions. The PCM-controlled clutch will engage and pull air over the condenser when the air conditioning is struggling to cool the cabin. This helps to improve the performance of the air conditioning system and keep the cabin comfortable.
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They allow the fan to be operational at low speeds and disconnected at high speeds
A fan clutch is a temperature-controlled coupling between the water pump shaft and the fan. It helps the cooling system operate effectively and the engine to operate efficiently.
When the engine gets warm, the fan clutch starts to spin faster to create more airflow. This allows the fan to be operational at low speeds and disconnected at high speeds. This is achieved through the use of a silicone fluid to engage and disengage the fan.
The fan clutch is designed to keep the engine temperature in check. When the clutch reaches the proper temperature and locks, the fan can make a roaring sound. Once fully warmed and "locked", the fan should come to a stop quickly with the engine shut down.
The PWM-controlled electronic fan clutch is an example of a fan clutch that can be used to improve the performance of a vehicle's cooling system. It can be controlled to engage and disengage the fan at specific temperatures, improving the efficiency of the cooling system and reducing the power loss associated with fan operation.
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They are controlled by the vehicle's computer
An electronic fan clutch is a temperature-controlled coupling between the water pump shaft and the fan. It allows the fan to be operational at low speeds and disconnected at higher speeds. This helps the engine to operate more efficiently by removing the load that the fan places on it.
Electronic fan clutches are controlled by the vehicle's computer, which sends a signal to the valves. The PCM (Powertrain Control Module) has limits set for the RPM of the fan and can soften the fan engagement if the coolant temperature is under a specified value. This allows for a consistent and repeatable fan clutch action.
The PCM-controlled clutch will engage and pull air over the condenser when the condenser heat is not enough to engage a standard clutch and the AC is struggling to cool. This is particularly useful when the cabin temperature is high, such as 140°F as mentioned in one example.
The PWM (Pulse Width Modulation) clutch is quick to fully engage but slower to return to a freewheel state when controlled by a simple ON/OFF method. In some cases, a PWM-controlled electronic fan clutch swap can be performed to improve the performance of the cooling system.
Overall, the electronic fan clutch, controlled by the vehicle's computer, plays an important role in maintaining the engine's temperature and efficiency by regulating the fan speed according to the coolant temperature and other factors.
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They can be non-thermal, thermal, or electronic
An electric fan clutch is a thermostatic engine cooling fan that can freewheel at low temperatures when cooling is not needed, allowing the engine to warm up faster, relieving unnecessary load on the engine. As temperatures increase, the clutch engages so that the fan is driven by engine power and moves air to cool the engine.
Fan clutches can be non-thermal, thermal, or electronic. Non-thermal fan clutches are rpm-dependent. Centrifugal force pushes the fluid against the valves. At low rpm, the valves are open, allowing the fluid to flow and engaging the fan. As rpm increases, the centrifugal force closes the valves and keeps the oil in the reservoir, disengaging the fan.
Thermal fan clutches use a bi-metallic spring to sense temperature. When the engine is cool, the fan is disengaged. As the temperature increases, the spring rotates the valve plate and allows the fluid to flow, engaging the fan. As the temperature drops, the spring relaxes, rotating the valve plate back.
Electronic fan clutches operate the same way as a thermal clutch, but the valves are controlled by a signal from the vehicle's computer.
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They limit torque, so less horsepower is used
An electric fan clutch is a temperature-controlled coupling between the water pump shaft and the fan. It allows the fan to be operational at low speeds and disconnected at higher speeds. This helps the engine to operate more efficiently by removing the load that the fan places on it.
Fan clutches limit torque, so less horsepower is used. Mechanical fans without a clutch typically have three times the horsepower losses of a clutch fan. Clutch fans can also free up more horsepower than an old cast-iron stock intake manifold.
Fan clutches are designed to keep air moving through the radiator to keep engine temperatures in check. When the engine gets warm, the fan clutch "grabs", causing it to spin faster to create more airflow.
Electronic fan clutches operate in the same way as a thermal clutch, but the valves are controlled by a signal from the vehicle's computer. The PCM-controlled clutch will engage and pull air over the condenser due to the elevated AC head pressure.
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Frequently asked questions
A fan clutch is a temperature-controlled coupling between the water pump shaft and the fan. It allows the fan to be operational at low speeds and disconnected at higher speeds.
When the engine gets warm, the fan clutch starts to spin faster to create more airflow. When the clutch reaches the proper temperature and locks, the fan can make a roaring sound.
An electric fan clutch operates in the same way as a thermal clutch, except that the valves are controlled by a signal from the vehicle's computer.
