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Front Window Regulator Replacement
 
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Pelican Technical Article:

Front Window Regulator Replacement

Steve Vernon

Time:

3 hours3 hrs

Tab:

$210

Talent:

***

Tools:

Phillips screwdriver, trim removal tool, 8mm, 10mm socket

Applicable Models:

Mercedes-Benz W124 (1986-95)

Parts Required:

New Regulator

Hot Tip:

Door panels are expensive, take your time

Performance Gain:

Dry interior when raining

Complementary Modification:

Replace switches

This article will show you how to replace your front window regulator. To get to the window regulator you will need to remove the door panel and while it is not a difficult job, but the door panels can be very expensive so take your time and double check things. Please see our article on front door panel removal for additional assistance. Also, if you are going to be working on your own car, it is a good idea to purchase a set of trim removal tools. They are a set of hard yet flexible plastic tools of different shapes and sizes that are used in removing trim pieces. They work a lot better than a flat-head screwdriver and there is nothing worse than ruining a "do-it-yourself" project by scratching up your car or damaging expensive interior pieces. Pelican sells a full line of these tool sets for under $20.

Before you begin removing the door panel you should park the car on as level ground as possible. Nothing is more frustrating that trying to work on the door while it is swinging open or closed.

With the door panel off you will see the speaker (green arrow) and the weather protective membrane (yellow arrow).
Figure 1

With the door panel off you will see the speaker (green arrow) and the weather protective membrane (yellow arrow). The window should be lowered to approximately1 inch above the weather stripping or seals (red arrow). If the glass is stuck in the down position you can still perform the task, if the window is stuck in the up position you will need to get it lowered enough so you have access to the window lifting rail. Do yourself a favor and replace your regulator when it starts to go bad and not after it fails completely.

Remove the four 8mm nuts holding the speaker in place (red arrows).
Figure 2

Remove the four 8mm nuts holding the speaker in place (red arrows). Disconnect the speaker wire and remove the speaker and housing from the door.

Carefully peel back the membrane (you will want to reinstall it later) to give you access to the inner door frame (red arrow).
Figure 3

Carefully peel back the membrane (you will want to reinstall it later) to give you access to the inner door frame (red arrow).

Use a Philips head screwdriver and disconnect the wiring from the block on the door (red arrow).
Figure 4

Use a Philips head screwdriver and disconnect the wiring from the block on the door (red arrow). Free up the wiring so it can pass freely through the door when you remove the regulator.

Depending on the stereo option on your vehicle you may or may not have to drill out the speaker support frame before removing the regulator.
Figure 5

Depending on the stereo option on your vehicle you may or may not have to drill out the speaker support frame before removing the regulator. If you have the frame very carefully drill out the rivets (red arrow) holding the frame to the door; remember the glass and wiring are behind the frame. Clip whatever zip ties are holding the wiring harness to the door (yellow arrow).

Carefully feed the frame through the opening in the door and remove it from the vehicle (red arrow).
Figure 6

Carefully feed the frame through the opening in the door and remove it from the vehicle (red arrow).

Use a 10mm socket and remove the forward nut holding the leading edge of the regulator to the window lifting rail (red arrow).
Figure 7

Use a 10mm socket and remove the forward nut holding the leading edge of the regulator to the window lifting rail (red arrow). Remove the forward section from the rail.

Tilt the window forward in the front and raise it in the back until you can slide the Teflon out from the gap in the window lifting rail (red arrow).
Figure 8

Tilt the window forward in the front and raise it in the back until you can slide the Teflon out from the gap in the window lifting rail (red arrow).

Lift the window up out of the way and use one of your trim removal tools to wedge it in place (red arrow).
Figure 9

Lift the window up out of the way and use one of your trim removal tools to wedge it in place (red arrow).

Use a 10mm socket and remove the five nuts holding the regulator to the door (red arrows).
Figure 10

Use a 10mm socket and remove the five nuts holding the regulator to the door (red arrows).

Carefully move the regulator until you can remove it from the opening in the lower door.
Figure 11

Carefully move the regulator until you can remove it from the opening in the lower door. Installation is the reverse of removal.



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Comments and Suggestions:
65beto Comments: Do you have in stock this window regulator for a 1995 E320 Cabriolet?

March 28, 2016
  Followup from the Pelican Staff: Yes.

Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
hogweed Comments: 1994 e320 coupe-
it appears the regulator is riveted in.
April 9, 2015
  Followup from the Pelican Staff: You will h ave to drill the rivets out and replace them with new. - Nick at Pelican Parts  
schlazor Comments: I was able to avoid removing the speaker bracket by taking the motor off the regulator while it was disconnected from the window but still in the door. I'm not sure it saved much time as it is a bit fiddly, but I didn't have to drill out rivets and find a new way to secure the bracket.
March 27, 2015
  Followup from the Pelican Staff: Thanks for the additional info and feedback. We appreciate it.
- Nick at Pelican Parts
 

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