Replacing A BMW E90 Radiator In 94 Seconds

Introduction

This tutorial provides a step-by-step guide on how to replace the radiator in a BMW E90 model, specifically the 2008 BMW 328i wagon. Although the video offers a quick overview, this guide includes detailed instructions to help you navigate the process safely and effectively.

Step 1: Prepare the Vehicle

• Gather Tools and Materials:

  • T20 and T25 Torx screwdrivers
  • 10mm and 8mm sockets
  • New radiator
  • Coolant (preferably a 50/50 mix)

• Safety First:

  • Ensure the engine is cool before starting.
  • Disconnect the battery.

Step 2: Remove the Airbox

• Disconnect the Mass Airflow Connector:

  • Locate the connector and undo the clamp.

• Unscrew the Airbox:

  • Use a 10mm socket to remove any screws securing the airbox.
  • Carefully lift the airbox out of the engine compartment.

Step 3: Disconnect Hoses and Electrical Connections

• Remove Hoses:

  • Locate the upper and lower radiator hoses.
  • Use a T25 screwdriver to detach the hoses from the radiator.
  • Yank both hoses off carefully.

• Disconnect the Fan Connector:

  • Unplug the fan connector to ensure complete disconnection.

Step 4: Remove the Old Radiator

• Unscrew the Radiator:

  • Use an 8mm socket to remove bolts securing the radiator.
  • Ensure that you check for any additional screws that may be holding it in place.

• Lift the Radiator Out:

  • Gently lift the old radiator out of the engine bay, taking care not to damage any surrounding components.

Step 5: Install the New Radiator

• Position the New Radiator:

  • Place the new radiator in the same position as the old one.

• Secure the Radiator:

  • Reinstall the screws using the 8mm socket.

• Reconnect Hoses:

  • Reattach the upper and lower hoses to their respective ports on the new radiator.

Step 6: Reinstall the Airbox

• Position the Airbox:

  • Set the airbox back into its original position.

• Reconnect the Mass Airflow Connector:

  • Secure the connector and tighten the clamp.

Step 7: Refill the Cooling System

• Add Coolant:
  • Fill the radiator with the recommended coolant mix until it reaches the appropriate level.

Step 8: Bleed the Cooling System

• Prepare to Bleed:

  • With the key in the ignition, push the start button with your foot on the brake.
  • Turn the fan on low and set the heat to maximum.

• Bleeding Process:

  • Run the engine for about 10 seconds and monitor the coolant level.
  • If the level drops, top it off until it stabilizes.

Step 9: Check for Leaks

• Inspect the System:
  • Start the engine and allow it to reach operating temperature.
  • Look for any leaks around the hoses and radiator.

Conclusion

Replacing the radiator in your BMW E90 can be a straightforward process if you follow these steps carefully. Always ensure the vehicle is cool and take your time during disassembly and reassembly. After confirming there are no leaks, your car should be ready for the road again. For ongoing maintenance, consider regularly checking coolant levels and the condition of your radiator and hoses.