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Rear Window Regulator Replacement
 
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Pelican Technical Article:

Rear Window Regulator Replacement

Steve Vernon

Time:

2 hours2 hrs

Tab:

$400

Talent:

**

Tools:

10mm socket, trim removal tools

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 rear 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 because there is no way to get the window back up into the closed position once it fails short of replacing the regulator. Remember that window regulators are specific to the front and rear as well as sides so make sure you order the right one.

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 rear 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 rear 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).

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.

Follow the wiring out from the window regulator motor (red arrow) until it comes to the switch (yellow arrow); depending on what type of switch you have in your vehicle will determine what you do from here.
Figure 4

Follow the wiring out from the window regulator motor (red arrow) until it comes to the switch (yellow arrow); depending on what type of switch you have in your vehicle will determine what you do from here.

On our vehicle we had to clip the wiring and redo the joiners with the new motor; your switch may be different.
Figure 5

On our vehicle we had to clip the wiring and redo the joiners with the new motor; your switch may be different.

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 6

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 7

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.

Release the 10mm bolts for the rear window channel (red arrows) and then remove the 10mm fasteners for the window regulator (yellow arrow).
Figure 8

Release the 10mm bolts for the rear window channel (red arrows) and then remove the 10mm fasteners for the window regulator (yellow arrow). With the rear window channel lose you can lower the regulator down into the door cavity.

Pass the regulator and motor out from the opening in the door.
Figure 9

Pass the regulator and motor out from the opening in the door. Installation is the reverse of removal.


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