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Rear Quarter Window Removal
 
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Pelican Technical Article:

Rear Quarter Window Removal

Tom Morr

Time:

2 hours2 hrs

Tab:

$202 (per regulator)

Talent:

**

Tools:

T30 Torx bit, 13mm socket, Phillips screwdriver

Applicable Models:

Mercedes-Benz R170 (1998-04)

Parts Required:

Replacement regulator, motor and/or window glass

Hot Tip:

Remove the regulator with the glass down to help keep the Vario roof in sync

Performance Gain:

Improved security and weather-proofing

Complementary Modification:

Lube the regulator's moving parts with lithium grease or silicone spray

When working properly, the R170's rear quarter windows retract into the body, in front of the B-pillar. Service access to these windows appears difficult on casual inspection.

However, a rear quarter window can be easily removed in as little as a couple hours. Preliminary steps covered in other articles are B-Pillar Cover Removal and Interior Rear Wall Removal. In reality, the entire rear panel doesn't need to be removed. Only the side with the faulty quarter window has to be undone and peeled back to access the window's electrical plug and mounting nut.

Front windows are typically disassembled during removal. In contrast, the R170 rear quarter windows come out as a single assembly: glass, regulator, motor and wiring harness. Once out of the car, the individual components can be easily disassembled and replaced as needed.

The quarter windows are part of the Vario roof system. The roof needs to be lowered (at least half way) in order to lift the quarter window assembly up and angle it out. If the roof is working properly, the quarter windows will lower as part of the roof sequence. When replacing the glass, regulator and/or motor, make sure that the window is reinstalled in the down position. (Use a battery charger or other 12-volt source on the motor's pigtail pins to lower the glass if necessary.) Otherwise, the roof will be out of sync with the replacement window: creating a new problem in the process of solving another.

Finally, watch the window as it raises for the first time (using the roof switch). If adjusted properly, the glass should slide into the groove on the top's weatherstripping. Otherwise, the glass needs to be adjusted on the regulator, or the regulator's bolts and nuts need to be re-positioned slightly on the car's body.

With the top at least half way down, the B-pillar cover is removed, and then the rear wall panel is peeled back (see those two articles for details).
Figure 1

With the top at least half way down, the B-pillar cover is removed, and then the rear wall panel is peeled back (see those two articles for details). Either one or two Phillips screws, depending on model year, secure the quarter window's seal. The pre-facelift 2000 SLK230 Kompressor that I'm working on has two screws (forward one indicated with arrow).

Lift up the weatherstripping to reveal the rear screw (arrow).
Figure 2

Lift up the weatherstripping to reveal the rear screw (arrow). Remove the screw.

The felt/rubber weatherstripping seal and its plastic base can now be lifted off the car.
Figure 3

The felt/rubber weatherstripping seal and its plastic base can now be lifted off the car.

Mark the regulator's bolts' positions if necessary so that the window assembly can be reinstalled in the same position.
Figure 4

Mark the regulator's bolts' positions if necessary so that the window assembly can be reinstalled in the same position. (The holes allow some adjustability for optimal glass sealing on the top's weatherstripping.) The bolts (arrows) come out using a T30 Torx bit. If they fall into the body, a long, flexible magnet will be needed to retrieve them.

The window motor's plug (arrow) is mounted to the rear wall, behind the seat.
Figure 5

The window motor's plug (arrow) is mounted to the rear wall, behind the seat. Unclip it.

A nut (red arrow) secures the window regulator to the body's inner side, above the seat belt retractor.
Figure 6

A nut (red arrow) secures the window regulator to the body's inner side, above the seat belt retractor. Remove the nut. Then pass the plug (yellow arrow) and wire through the inner body panel, unplugging the protective rubber grommet in the process.

The window assembly can now be lifted up and angled out of the body.
Figure 7

The window assembly can now be lifted up and angled out of the body.

Two nuts (arrows) hold and adjust the window glass on the regulator.
Figure 8

Two nuts (arrows) hold and adjust the window glass on the regulator.

On the back side, three screws (arrows) secure the motor to the regulator.
Figure 9

On the back side, three screws (arrows) secure the motor to the regulator. Installation is the reverse of the removal steps.

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Page last updated: Fri 12/9/2016 02:40:47 AM