The Ultimate Guide to Installing Chevy GMC Truck Dual Electric Fan Harness

January 17, 2024

What is a Dual Electric Fan Harness?

A dual electric fan relay harness is a crucial component for improving the cooling system of your Chevy GMC truck. It allows you to upgrade your stock mechanical fan to a more efficient electric fan setup. This harness provides the necessary wiring and relays to control the operation of the dual electric fans, ensuring optimal cooling performance.

Why Upgrade to a Dual Electric Fan Harness?

Upgrading to a dual electric fan relay harness offers several benefits for your Chevy GMC truck:

Enhanced Cooling: The dual electric fans provide better airflow and cooling efficiency compared to the stock mechanical fan, especially in high-temperature conditions.
Improved Engine Performance: By maintaining optimal engine temperature, the dual electric fans help prevent overheating, which can lead to reduced power and performance.
Increased Fuel Efficiency: Efficient cooling reduces the strain on the engine, resulting in improved fuel economy.
Extended Engine Lifespan: Proper cooling helps prolong the life of your engine by reducing wear and tear caused by excessive heat.
- List of Chevy and GMC vehicles compatible with the dual electric fan harness 2000 - 2007 old style

How to Install a Chevy GMC Truck Dual Electric Fan Relay Harness

Follow these step-by-step instructions to install a dual electric fan relay harness in your Chevy GMC truck:

Step 1: Gather the Necessary Tools and Materials

Before you begin the installation process, make sure you have the following tools and materials:

Socket set
Wire cutters
Wire strippers
Electrical tape
Heat shrink tubing
Zip ties
Mounting hardware

Make sure you have the correct Fan Relay Harness. Here is the provided relay for the harness available for purchase from Auto101.

https://auto101.net/products/chevy-gmc-truck-dual-electric-fan-relay-harness-oem-standalone-2000-2006

Step 2: Disconnect the Battery

Prior to any electrical work, disconnect the negative terminal of the battery to prevent any accidental short circuits.

Step 3: Remove the Stock Mechanical Fan

Remove the stock mechanical fan from your Chevy GMC truck. Refer to the vehicle's service manual for specific instructions on how to remove the fan assembly.

Step 4: Mount the Dual Electric Fans

Mount the dual electric fans in the desired location, ensuring proper clearance and airflow. Use the provided mounting hardware to secure the fans in place.

Step 5: Connect the Wiring Harness and Plug Location/ID

Connect the wiring harness to the dual electric fans, following the manufacturer's instructions. Make sure to route the wiring away from any moving parts or hot surfaces. Check locations and identify your plugs before installation. Blue and Red Plugs are designated for 0411/4896.

Blue Plugs: PIN 42 | FAN 1

Red/green Plugs: PIN 33 | FAN 2

Then continue with the plug installation.

Step 6: Install the Relay and Fuse

Install the relay and fuse included in the dual electric fan relay harness. Follow the wiring diagram provided by the manufacturer to correctly connect the relay and fuse to the battery and fan wiring.

Step 7: Contact Local Tuner

Call/contact local tuner for vehicle details and other requirements before full installation has occurred.

Step 8: Test the Dual Electric Fans

After completing the installation, reconnect the battery and test the operation of the dual electric fans. Start the engine and let it idle while monitoring the fan operation. Ensure that both fans turn on and off as expected.

Step 9: Secure and Clean Up

Secure any loose wiring using zip ties and ensure that all connections are properly insulated with electrical tape or heat shrink tubing. Clean up the installation area and ensure there are no loose tools or materials.

Conclusion

Installing a Chevy GMC truck dual electric fan relay harness is a worthwhile upgrade for improving the cooling system of your vehicle. By following the step-by-step instructions and using the provided wiring harness, you can enjoy enhanced cooling performance, improved engine efficiency, and increased longevity for your engine. Upgrade your Chevy GMC truck today and experience the benefits of a dual electric fan setup!

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