Radiator Cooling Fan Controller

SW10078

Radiator Cooling Fan Controller

Radiator Fan Temp Controller Kit for 12V Vehicles.

The Shadow Radiator Cooling Fan Controller is designed for 12V vehicles and can directly drive OEM or aftermarket cooling fans, activating cooling earlier to keep the engine within its optimal operating temperature range.

The package includes a Shadow temperature sensor that can be installed on the engine hose or the controller itself for real-time monitoring. The controller features a digital LED display that clearly shows water temperature, oil temperature, and voltage. Users can freely set the fan activation temperature, while the smart fan-stop logic and warning functions ensure stable engine operation, prevent heat damage, and effectively reduce the risk of overheating.

In most vehicles, the ECU sets the radiator fan activation temperature at around 95°C for thermal efficiency. However, under heavy load or extreme driving conditions, this activation point can be too late, increasing the risk of engine overheating and premature component failure.

The Radiator Cooling Fan Controller provides an adjustable activation range from 70°C to 100°C. Users can fine-tune the settings according to different engine requirements, allowing the fan to engage earlier and effectively reduce the risk of overheating.

Equipped with a high-precision temperature sensor with a ±1% margin of error, it responds about 15% faster than conventional products, enabling real-time monitoring of coolant temperature changes. It can also track oil temperature and voltage, providing a more complete overview of engine conditions.

Smart Control Logic
-Adjustable fan activation temperature: 70–100°C
-Auto fan-stop function: when the temperature drops 5°C below the set value, the fan automatically stops running
-Built-in memory function: retains settings even after power is disconnected, eliminating the need for reconfiguration

All Key Engine Data on One Clear Display
- Coolant Temperature: 10–150°C
- Oil Temperature: 50–150°C
- Voltage: 8–17V

Supports customizable warning thresholds. When values exceed the preset limits, the display will flash to alert the driver.

⚠ This product is only compatible with DC fans and does not support PWM-controlled fans.
Equipped with a 12V / 30A relay output, it allows flexible installation methods depending on vehicle requirements.

Method: Connect the controller’s relay output in parallel with the OEM radiator fan relay control wire.
Effect: Retains the ECU’s original control logic while allowing the Shadow controller to activate the fan earlier through the OEM relay.
-Advantage: Combines factory protection with the benefit of earlier cooling engagement.

-Method: Connect the controller’s relay output directly in parallel with the radiator fan’s positive (or negative) wire.
-Effect: The controller can independently drive the fan without ECU limitations.
-Application: Suitable when the OEM wiring is damaged or bypassed, allowing the controller to directly operate the fan.

-Method: Install an additional DC high-power fan on the radiator or oil cooler, and connect the relay output to the power supply circuit.
-Effect: The auxiliary fan automatically activates under high temperatures or aggressive driving, further enhancing cooling efficiency.
-Application: Commonly used in modified setups with automatic transmission oil coolers or engine oil coolers.

Fuse Protection: It is recommended to connect a ≤30A fuse in the relay output circuit to reduce the risk of short circuits.
Wiring Setup: Do not connect the controller’s signal output directly to the fan. For high-current loads, always drive the fan through the relay.
Grounding Point: The controller, fan, and relay must share a common ground to prevent voltage drift and ensure accurate operation.
Terminal Treatment: Use proper terminals and heat-shrink tubing to avoid poor connections.

Dedicated to the development of automotive electronic accessories, Shadow delivers personalized solutions for car enthusiasts at a reasonable price with dependable quality. Our mission is to be the most trusted bridge between drivers and machines.

The Digital Radiator Cooling Fan Controller embodies our core values of accessibility, durability, and precision. Whether for daily driving or intense track use, it helps maintain the engine at its optimal operating temperature, preventing overheating and potential damage.

Specification

Movies

Fan Temp Controller instruction

Download

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  Radiater Cooling Fan Controller Instructions

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  Shadow 2025 Catalog - English Version

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