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Pelican Technical Article:

Front Window Adjustment

Tom Morr

Time:

1 hour1 hr

Tab:

$0

Talent:

*

Tools:

T27, T30 Torx bits, 10mm socket/wrench

Applicable Models:

Mercedes-Benz R170 (1998-04)

Hot Tip:

Lubricate the regulator's rails

Performance Gain:

Side windows seal against the weather stripping

Complementary Modification:

Replace torn door panel â€Ã..."foil” weather shields, body weather stripping

After replacing side windows, adjustment is necessary to align the glass properly with the weather stripping. The glass won't seal against the weather stripping if it's positioned too low on the regulator, creating a gap between glass and rubber. Possibly worse is glass that's too high -- shutting the door too aggressively can break the glass or bend the regulator if the top of the window hits the car's body.

Adjusting the window doesn't require specialized skills or tools. With patience, the height and angle of the glass can be tweaked until it creates a waterproof seal on the weather stripping.

If the window won't go up and/or down during the adjustment session, the SLK's Vario roof's controller might be overriding the window switch. Try turning the key on and off. Also, check to make sure that the battery hasn't drained. Putting a charger on it can restore proper switch function.

Holding both window buttons in the "up" position simultaneously for a few seconds after the glass is fully raised can let the car's controller re-learn the motor's new full up/full down cycle.

The project car shown here is a pre-facelift 2000 SLK230 Kompressor. Window adjustment theory for the face lifted cars is similar, but the details will vary since those cars have a cable-style window regulator.

Usually, the windows are adjusted when the glass is replaced.
Figure 1

Usually, the windows are adjusted when the glass is replaced. If not, the door panel and "foil" weather shield must be removed (see separate article).

Make sure that the door is square on the body before attempting to adjust the glass.
Figure 2

Make sure that the door is square on the body before attempting to adjust the glass. This window was installed with its hardware in the pre-removal position, but the glass is too high at the rear, preventing the door from closing.

Begin by loosening the 10mm nuts securing the stop brackets to the door.
Figure 3

Begin by loosening the 10mm nuts securing the stop brackets to the door. (purple arrows).

Raise the window until it follows the upper body line extending from the side-mirror triangle (purple arrow).
Figure 4

Raise the window until it follows the upper body line extending from the side-mirror triangle (purple arrow).

Remove the drain plug if it isn't already out.
Figure 5

Remove the drain plug if it isn't already out. Use a T27 Torx to loosen the guide rail's lower bolt (yellow arrow). NOTE: On some cars this might be a T30.

Adjust the window stops until the glass's upper edge seals on the weather stripping (yellow arrow).
Figure 6

Adjust the window stops until the glass's upper edge seals on the weather stripping (yellow arrow).

Lower the window.
Figure 7

Lower the window. If the motor stops before the glass (purple arrow) is below the rubber seals, the window will need to be adjusted downward.

On the pre-facelift R170 SLK, the regulator rail has slotted holes for window height adjustment (purple arrows).
Figure 8

On the pre-facelift R170 SLK, the regulator rail has slotted holes for window height adjustment (purple arrows).

The regulator's middle bolt (yellow arrow) allows longitudinal adjustment.
Figure 9

The regulator's middle bolt (yellow arrow) allows longitudinal adjustment. All three rail bolts have T30 Torx heads.

The window's slider can be tweaked for fine-tuning any top gaps between the glass and weather stripping.
Figure 10

The window's slider can be tweaked for fine-tuning any top gaps between the glass and weather stripping. Loosening the nut (purple arrow) allows the slider to be re-angled.

Play with the various adjuster screws and nuts until the glass retracts below the sill rubber and seals across the roof weather stripping.
Figure 11

Play with the various adjuster screws and nuts until the glass retracts below the sill rubber and seals across the roof weather stripping. If the existing glass is being reinstalled, resist the temptation to clean it yet. The dirt line (yellow arrow) serves as a guide for proper window adjustment (assuming the glass sealed properly before it was removed). Then tighten the nuts and bolt, replace the rubber drain plug, and lube the regulator and rails.

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Comments and Suggestions:
Remus Comments: I have to let windows down alittlebefore closing door then put window up the rest of way for it to seal on a 98 230 slkany advise
March 21, 2016
  Followup from the Pelican Staff: Sounds like a problem with the door pin switch or the window regulator. Do the interior lights come on when you open the door? - Nick at Pelican Parts  
Kimmy Comments: I am having a problem with my 1998 SLK 230, I put the top up, but the trunk stopped in the open position and small back windows will not go up. I had to manually close trunk lid. I can put the roof back down using the red button, but the song gets stuck in the open position. Can you give me some ideas as to what may be the problem with the trunk and the two small windows?
March 2, 2016
  Followup from the Pelican Staff: Start by checking the vehicle for fault codes. Sounds like a position switch is not in the right state. - Nick at Pelican Parts  
erf Comments: The T27 you mention is actually a T30... at least on my 98 230.
November 2, 2015
  Followup from the Pelican Staff: Thanks for the additional info. We appreciate it. I will have the article updated.
- Nick at Pelican Parts
 
32PROSPER Comments: I have a 230 slk had the top down. Went to close it, it started but stopped when trunk slid back. Bumping the switch forward was able to get it closed. Door windows wont go up. If I hit the switch back to re track open the top it moves a little and stops do it about 10 times it's almost open trunk lid won't close. Repete by pushing button forward about ten times it closes even the little side windows but not the door windows
September 6, 2015
  Followup from the Pelican Staff: Check the hydraulic fluid level.- Nick at Pelican Parts  

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