Replacing the Window Regulator on a Mercedes Vito W639

Learn how to change the window regulator on a Mercedes Vito W639: you will need a screwdriver, socket spanner, a pair of curved pliers, and some adhesive tape to secure the glass. The window regulator (without electric motor) can be found on eBay with code 276305825917 for £31.00, with free delivery.

With the vehicle off, remove the internal door cover by taking out the two screws under the door handle, the three lower rivet screws (remove the central core with pliers), and then unclip the cover using a trim tool (be careful with the green clips as they are very fragile).

Disconnect the electrical connectors and remove the speaker.

To install the door electronic module, use the curved pliers to press the plastic tabs and unlock the module. Secure the glass with adhesive tape to prevent it from falling during work, and remove the window regulator by unscrewing the two motor screws and disconnecting the connector.

Loosen the two lower nuts of the mechanism, and remove the upper ones, then extract the window regulator; unclip the glass fixing clips and gently lift the glass upwards, securing it again with tape. For the installation of the new part, proceed in reverse: tighten the nuts to the correct torque of 9 Nm for the glass clips and 14 Nm for the lower mechanism nuts.

Reconnect all electrical connectors and reposition the cover. Calibrate the system by starting the vehicle and test the window regulator in automatic mode (press and hold the up/down button until it stops by itself).