Open Mon–Fri 9–6 · Open Saturdays 9–4 54/58 Princes Hwy, Arncliffe, Sydney NSW · minutes from Sydney Airport Call 0418 200 289
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Model file · Mercedes-Benz CLK & SLK windows

Mercedes CLK & SLK window regulator repair, Sydney

A rear quarter window on a CLK cabriolet that has dropped into the body and won't come up. An SLK door window that stalls halfway, comes up crooked, or sits low enough to whistle at speed. A roof that won't move because one window hasn't dropped. On a convertible the windows and the roof are one system, and the window regulators are the part of it that wears out first. We rebuild and replace them in our Arncliffe workshop, then set the glass up so the roof cycles and seals the way it did new.

20+ yrs in automotive repair 1000+ roofs serviced 4.9★ Google rating
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20+years in automotive repair
1000+roofs diagnosed & serviced
4.9★Google rating
  • Factory-trained technicians
  • OEM & premium aftermarket parts
  • Latest diagnostic equipment
  • Parts & labour warranty

The CLK and SLK window pattern

What the windows do as they age,
and why the roof cares

Every window on these cars is frameless. The glass has to drop a few millimetres whenever a door opens, drop fully before the roof moves, and come back up to seal against a rubber on the roof itself. That is a lot of travel for a regulator that was built with plastic sliders, and after twenty years the plastic is what gives up.

Pattern 01

CLK cabriolet: the rear quarter window that drops

A208 · A209 · rear quarter regulators

How it shows up

The rear window sinks into the body and won't come back, comes up crooked or with a crunch, stops partway, or creeps down a couple of centimetres on the motorway. The switch clicks and the motor whirs, so it feels electrical. The front door windows do the same thing later in life, but the rear quarters go first because they carry the most weight on the least hardware.

What's behind it

The regulator carries the glass on plastic sliders and guide blocks that ride in a metal channel. Heat and age crack them, and once one lets go the cable or arm runs out of line and the glass jams or drops. The motor is usually fine. Owners are sometimes told the whole regulator and motor assembly is the only fix; it rarely is.

What we do

Trim off, glass supported, and the failed part in your hand before anything is quoted. Where the frame and cable are sound we rebuild the regulator with new sliders and guides and re-tension it. Where they aren't, a reconditioned or new regulator, with both options on the quote. Then the glass is set for height and tilt so it seals against the roof rubber, and the window is initialised.

Call about a CLK window Submit an enquiry Text us the model
Pattern 02

SLK: a door window that stalls, drops or won't seal

R170 · R171 · R172 · door regulators

How it shows up

The window stops halfway and reverses, rises slowly or on a slant, or settles a little after the door shuts. At speed there is wind noise along the top edge, and after rain a damp line on the door card, because the glass is sitting a few millimetres low against the roof seal. The short drop when the door handle is pulled starts to misbehave too.

What's behind it

SLK regulators are cable type. The cable wears at the pulleys and the slider, the rails dry out, and the glass starts to bind. The anti-pinch then does what it is designed to do and reverses the window, which reads as a fault in the motor or the switch. Sometimes it is the switch or the door module; more often it is the regulator, and the scan tool tells us which.

What we do

Diagnose regulator against motor, switch and module before quoting. Rebuild or replace the regulator, clean and lubricate the rails, then set the glass so it meets the roof seal squarely along its whole length. Normalise the window so the short drop and anti-pinch work again, and cycle the roof with the car to prove it.

SLK vario roof: the model file → Submit an enquiry
Pattern 03

The roof that won't move because of a window

Windows and roof are linked

How it shows up

You press the roof switch. The windows drop partly or not at all, the roof either does nothing or stops at its first stage, and a message comes up on the dash. It looks like the roof has failed, and the phone call usually starts with the words "the roof is stuck".

What's behind it

The roof controller lowers every window before it releases the roof and checks their positions as it goes. A regulator that stalls, or a window that has lost its position memory after a flat battery or a previous repair, stops the sequence before the roof has done anything. The hydraulics and the roof motor are often fine.

What we do

The windows are repaired and initialised first, because they are linked to the roof and nothing else can be judged until they run right. Then the roof is cycled. If it still hesitates once the windows are correct, that becomes its own diagnosis, usually a cylinder, a sensor or the boot-separator flap, and it is quoted separately, with your go-ahead first.

Roof won't open or close → Hydraulic ram rebuilds → Stuck open: do this first →

Models we cover

CLK, SLK and the other convertibles
whose windows run the roof

The regulator design changes between generations, the failure doesn't. If yours isn't listed, text us the model and year and we'll tell you what we'd check first.

CLK A208 (1998 to 2003)
CLK200 Kompressor, CLK230, CLK320, CLK430 and CLK55 AMG cabriolets. Rear quarter regulators are the regular arrival: sliders cracked, glass dropped or jammed. Door regulators follow with age.
CLK A209 (2003 to 2010)
CLK200 Kompressor, CLK240, CLK280, CLK320, CLK350, CLK500 and the CLK55 and CLK63 AMG. Same rear quarter arrangement, same plastic parts, same fix. The C208 and C209 coupes share the rear quarter regulators.
SLK R170 (1996 to 2004)
SLK200, SLK230 Kompressor, SLK320 and SLK32 AMG. Cable regulators in frameless doors, worn at the pulleys and slider by now on most cars, plus dry rails.
SLK R171 (2004 to 2011)
SLK200 Kompressor, SLK280, SLK300, SLK350 and SLK55 AMG. Windows that stall and reverse, sit low against the roof seal, or stop the roof from starting.
SLK R172 & SLC (2011 to 2020)
SLK200, SLK250, SLK350, SLK55 AMG and the later SLC. Fewer regulator failures yet, more module and initialisation work after batteries and door repairs.
Other convertibles
Mini R52 and R57 rear quarter windows, BMW E46 and E93, Audi A4 and A5 cabriolets, VW Eos and the folding hardtops we already work on. Wherever the roof waits for the windows, the window is our job too.

Not sure which window or which generation? Text us the model and year or call 0418 200 289 and we'll tell you straight away.

How a visit works

Four steps. No surprises.

  1. 1

    Tell us the window and the symptom

    Call 0418 200 289 or text a short video of the window with the switch pressed. "CLK320, rear left window dropped and the roof won't start" is enough for a first read, usually the same business day.

  2. 2

    We diagnose, you see it

    Scan tool first to separate regulator from motor, switch and module. Then the trim comes off and the broken slider, worn cable or bent frame is shown to you before anything is quoted.

  3. 3

    Rebuild or replace, then set the glass

    Regulator rebuilt with new sliders and guides, or a reconditioned or new unit fitted, both on the quote. The glass is set for height and tilt against the roof seal and the window initialised. OEM or premium aftermarket parts, your go-ahead first.

  4. 4

    We cycle the roof and rain on it

    Every window run through its full travel, the roof cycled with the car, then the seals water-tested, because a window that sits a few millimetres low is a leak waiting for the next storm. Covered by our parts & labour warranty.

Straight answers

CLK and SLK window questions
we hear most

If yours isn't here, call. You'll get the same straight answer.

Ask us directly Submit an enquiry
My CLK's rear quarter window dropped into the body and won't come up. Is the motor dead?

Usually not. On the CLK the rear quarter window rides on a regulator with plastic sliders and guide blocks, and those crack with age and heat. Once one lets go the glass runs out of line and drops or jams while the motor keeps whirring. We take the trim off, confirm which part failed and show you, then rebuild the regulator with new sliders and guides where the frame and cable are sound, or fit a reconditioned or new regulator where they aren't. The motor is only replaced if it has actually failed.

Can a Mercedes window regulator be rebuilt, or does it need to be replaced?

Often it can be rebuilt. Most CLK and SLK regulator failures are the plastic sliders, rollers and guides, not the metal frame or the motor, and we replace those parts and re-tension the cable rather than swapping the whole unit. Where the frame is bent, the cable has frayed or the rails are worn through, a reconditioned or new regulator is the right call, and we lay the options out side by side before you decide. Either way the glass is set up to seal against the roof and the window is initialised afterwards.

My SLK roof won't open and the windows didn't drop first. Are the two related?

Yes. On the SLK, the CLK and most powered convertibles the roof controller lowers the windows before it releases the roof and checks their position as it goes. If a window regulator stalls or has lost its position memory, the roof stops at the first stage or won't start, and it looks like the roof has failed. The window has to be repaired and initialised first; the roof is cycled after that. If the roof still hesitates once the windows are right, that's a separate diagnosis, usually hydraulics or a sensor. See roof won't open or close.

Do you repair window regulators on the CLK coupe, or on other convertibles?

Yes to the CLK coupe: the C208 and C209 use the same rear quarter regulators as the cabriolet. We also do window regulators on other convertibles and folding hardtops where the windows and roof are linked, for example the Mini R52 and R57 rear quarter windows and the BMW, Audi and VW cabriolets we already work on. For a sedan or hatch with an ordinary door window fault, text us the model and we'll tell you honestly whether it's one for us.

What owners say

From Mercedes convertible owners

★★★★★

"Michael is the best. My Benz had a seized panoramic sunroof and the motor for the roof died. He had it fixed and working perfectly in three hours. And was by far the most reasonably priced."

Mercedes-Benz · Seized panoramic sunroof & motor
★★★★★

"Mr Michael fixed the sunroof in an hour with a very reasonable price. Took the car to Mercedes and they said it can't be fixed. They should not be called Mercedes."

Mercedes-Benz · Sunroof repair
★★★★★

"Ming did an EXCELLENT job fixing the sunroof on my C200. His pricing is fair and his work is great. I needed this done urgently, and he did everything he could to squeeze me in. I could not recommend Convertible and Sunroof Auto Centre highly enough!"

Mercedes-Benz C200 · Sunroof repair

Visit the workshop

Bring it in, or start
with a text

Address
54/58 Princes Hwy, Arncliffe, Sydney NSW 2205, minutes from Sydney Airport
Hours
Mon–Fri 9am–6pm · Sat 9am–4pm · Sun closed

Start an enquiry

A few details so we can tell you whether it's a job for us and how we'd approach it. By appointment; for most faults, we diagnose before quoting. For urgent enquiries or if we missed you, call 0418 200 289.

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