W140 Installing New Blower Motor Into Old Fan and Housing

Jul 6, 2023


Welcome to Grafco Electric, your trusted source for high-quality electrical solutions. In this comprehensive guide, we will walk you through the process of replacing the blower motor in your Mercedes W140 with ease. Our step-by-step video tutorial will provide you with detailed instructions, expert tips, and all the necessary information to successfully install a new blower motor into your old fan and housing.

Why Replace the Blower Motor?

Over time, the blower motor in your Mercedes W140 may start to malfunction, resulting in poor air circulation or complete failure. This can lead to uncomfortable driving conditions, especially during extreme weather. Replacing the blower motor is essential to restore proper ventilation and maintain a comfortable interior environment.

Step 1: Gather the Required Tools

Before you begin the replacement process, make sure you have the necessary tools. Here's a list of items you'll need:

  • Socket set
  • Phillips and flathead screwdrivers
  • Torque wrench
  • Trim removal tools
  • Blower motor replacement kit

Step 2: Disconnect the Battery

To ensure your safety and avoid any electrical mishaps, start by disconnecting the car battery. This will prevent any accidental activation of the blower motor during the replacement process.

Step 3: Access the Blower Motor

The blower motor is typically located beneath the dashboard on the passenger side of your Mercedes W140. Use the trim removal tools to carefully remove any necessary panels or covers to gain access to the blower motor.

Step 4: Remove the Old Blower Motor

Using the appropriate tools, detach the wiring harness and any mounting screws that secure the old blower motor in place. Once all connections are disconnected, carefully remove the old blower motor from the fan and housing assembly.

Step 5: Install the New Blower Motor

Take the new blower motor from the replacement kit and align it with the fan and housing assembly. Ensure all necessary connections and mounting screws are properly secured. Double-check that everything is in place before proceeding.

Step 6: Reassemble and Test

Reassemble any panels or covers that were previously removed to access the blower motor. Once everything is securely in place, reconnect the car battery. Switch on the vehicle's ventilation system to test the newly installed blower motor. Ensure proper functionality by checking different fan speed settings.


Congratulations! You have successfully installed a new blower motor into your Mercedes W140 with the help of Grafco Electric's comprehensive video guide. Enjoy optimal air circulation and a comfortable driving experience once again. If you have any further questions or need additional assistance, don't hesitate to reach out to our expert team at Grafco Electric. We are here to ensure your electrical needs are met with the highest quality solutions and customer support.

Shawn Bakker
Great guide, very helpful!
Oct 6, 2023