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Front Window Regulator Replacement
 
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Pelican Technical Article:

Front Window Regulator Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$400

Talent:

**

Tools:

10mm socket

Applicable Models:

Mercedes-Benz W123 (1977-85)

Parts Required:

Window regulator

Hot Tip:

Remove the door panel and set the window at the right height before disconnecting the battery

Performance Gain:

Working windows

Complementary Modification:

Fix any broken door clips

If your front windows are starting to make funny noises when you put them up or down, binding or not running smoothly all the way through the range of motion there is a good chance your window regulators are starting to fail. It is a good idea to replace the regulator before it fails completely as you do not want to be stuck with a broken window mechanism if it starts raining.

Over the years your car may have been serviced by multiple people including previous owners and this can lead to parts replaced with different size fasteners and hardware. The sizes of the nuts and bolts we give may be different from what you have so be prepared with different size sockets and wrenches. If something is different on your vehicle please let us know and share your info to help other users. If you have any questions or comments or even a different procedure you would like to share please leave it below and please leave your vehicle information.

To replace the front window regulator you must first remove the door panel, please see our article on door panel removal for additional assistance.
Figure 1

To replace the front window regulator you must first remove the door panel, please see our article on door panel removal for additional assistance.

With the door panel removed raise or lower the window until you can access the two 10mm bolts that hold the window glass to the regulator (red arrows).
Figure 2

With the door panel removed raise or lower the window until you can access the two 10mm bolts that hold the window glass to the regulator (red arrows). One is accessed through an opening in the door and the other needs to be clear of the regulator mechanism.

With the window in the correct position, disconnect the ground strap from the battery and place it somewhere where it cannot accidentally come in contact with the post while you are working.
Figure 3

With the window in the correct position, disconnect the ground strap from the battery and place it somewhere where it cannot accidentally come in contact with the post while you are working.

Make sure you mark the wiring to the regulator (red arrow) and then disconnect them from the mount.
Figure 4

Make sure you mark the wiring to the regulator (red arrow) and then disconnect them from the mount.

Use a 10mm socket and extension and remove the two bolts holding the glass to the regulator, make sure not to let the glass fall in the door once it is free.
Figure 5

Use a 10mm socket and extension and remove the two bolts holding the glass to the regulator, make sure not to let the glass fall in the door once it is free.

Raise the window all the way up and secure it in place; if you are going to tape it in place make sure to clean the glass first so you get a good bond.
Figure 6

Raise the window all the way up and secure it in place; if you are going to tape it in place make sure to clean the glass first so you get a good bond.

You are going to be removing the regulator out from the bottom opening in the door so it is a good idea to disconnect the vacuum door lock arm from the actuator (yellow arrow) and move it out of the way.
Figure 7

You are going to be removing the regulator out from the bottom opening in the door so it is a good idea to disconnect the vacuum door lock arm from the actuator (yellow arrow) and move it out of the way. Use a 10mm socket and remove the nuts and bolts that hold the regulator to the door (red arrows).

The regulator will need to be lowered and removed from the channel in the door (red arrow).
Figure 8

The regulator will need to be lowered and removed from the channel in the door (red arrow).

Lower the motor and compress the arms on the mechanism and remove it from the opening in the lower door.
Figure 9

Lower the motor and compress the arms on the mechanism and remove it from the opening in the lower door. Installation is the reverse of removal.


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Page last updated: Sun 6/25/2017 03:06:09 AM