This PWM controller enables the speed of a conventional 12V cooling fan to be varied precisely.

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It offers fine engine temperature management while reducing the load on the alternator

This PWM (Pulse Width Modulation) speed controller is perfectly suited to controlling a conventional 12V DC motor (2-wire) automotive radiator fan.

Unlike a simple ON/OFF relay, it allows:

✔ progressive triggering
✔ precise adjustment from 0 to 100
✔ fine adjustment to motor temperature
✔ reduction of current peaks on start-up

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🚗 Why is this interesting for a radiator fan?

A conventional fan generally operates on an on/off basis via a relay:

• sudden start-up
• high current peak
• high alternator load
• sudden thermal variation

With a PWM controller :

🌡️ Better control of engine temperature

The fan speed can be adjusted gradually according to the actual temperature, allowing :

• more stable regulation
• fewer thermal variations
• a motor operating in its optimum range

⚡ Less load on the alternator

• Smoother starting
• Fewer inrush peaks
• Lower average current
• Alternator less stressed

👉 Result:
✔ less electrical fatigue
✔ better system longevity
✔ more stable motor

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⚠️ Important

The controller must always be used with a load connected (motor or fan).
Never test without a load.

For fans exceeding 35A continuous, provide :

• wiring with the appropriate cross-section
• protection fuse
• additional heatsink if required

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⚙️ Technical specifications

• Type: PWM DC motor controller
• Compatibility: conventional 12V / 24V fans (2-wire)
• Voltage range: 9V to 60V
• Output voltage: linear under load
• Rated current : 35A
• Max current : 60A
• Speed setting: 0 to 100
• Display: digital LED
• Version: stabilised V2
• Voltage: 12 volts
• Temperature: -50°C to +90°C

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🚗 Applications

Perfect for :

• automotive radiator fan
• additional electric fan
• electric water pump
• workshop DC motor
• performance & engine swap applications

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💡 Autosport Discount Tip

For optimum installation in radiator fan management :

• use an external temperature sensor
• protect the circuit with a suitable fuse
• use a sufficient cable cross-section

Proper installation improves the engine’s thermal stability and reduces the vehicle’s overall electrical load.

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✅ Product benefits

✅ Compatible with conventional 12V radiator fans
✅ Fine engine temperature management
✅ Reduction of current peaks
✅ Lower alternator load
✅ Precise adjustment 0-100
✅ More stable V2 version
✅ Clear digital display
✅ Ideal engine preparation & cooling optimisation