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Porsche > 356 (1950-1965) > 356A 1955-59 > Electrical & Relays >

Window Mechanism

Window Mechanism

DISPLAYING 1 to 1 (of 1 products)
Window lifting rail. Porsche 356A T2 / 356B / 356C Cabriolet - 64454204521, 64454204621 - 644.542.045.21, 644.542.046.21, 1688100370, 1688100380
2
Window lifting rail. Porsche 356A T2 / 356B / 356C Cabriolet
64454204
Product Information
Product Information

OE Match window lifting rail for Porsche 356A T2, 356B and 356C Cabriolet models. It forms part of the door window mechanism and supports controlled movement of the glass.

Fits
Porsche 356A T2 / 356B / 356C Cabriolet


Diagram ref no 27


What This Product Does

The lifting rail connects the door glass to the window-lifting mechanism, helping the glass remain supported and correctly aligned while it is raised or lowered.


Functions

  • Supports the door window glass
  • Transfers movement from the window mechanism
  • Helps maintain smooth, even window travel
  • Assists correct glass alignment within the door guides


Technical Details

  • OE Match replacement window lifting rail
  • Left-hand reference: 64454204521
  • Right-hand reference: 64454204621


Symptoms of Fault

  • Door glass tilts or binds during operation
  • Window travel becomes uneven or requires assistance
  • Clicking, scraping or grinding from inside the door
  • Glass drops or does not remain securely supported
  • Difficulty fully opening or closing the window


Why Replacement Matters

A worn, bent or corroded lifting rail can affect window alignment and place additional strain on the regulator and guides. Replacing the damaged component helps restore consistent movement and allows the glass to close correctly against its seals.


FAQs

  • Is the rail side-specific?
    Yes. Reference 64454204521 is for the left side and 64454204621 is for the right side.
  • What should be inspected during installation?
    Check the regulator, glass guides, clamps and related fittings for wear, corrosion or incorrect alignment.
  • Why does the window glass tilt?
    A damaged lifting rail, loose glass mounting or wear elsewhere in the regulator mechanism can allow uneven movement.


Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

64454204
64454204521
64454204621

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About Window Mechanism

Window mechanisms are the core components that allow your Porsche’s windows to move smoothly up and down. Located inside the door panel, these assemblies typically consist of a regulator, cables, pulleys, and guides that work together to raise or lower the glass when activated by the electric window motor and switch.

At Design911, we supply high-quality window mechanism assemblies for all Porsche models - from classic air-cooled 911s to the latest Boxster, Cayman, Cayenne, Macan, and Panamera. Each part is designed to restore precise window movement and perfect alignment, ensuring your car retains its comfort, performance, and style.

What Do Window Mechanisms Do?
The window mechanism (or regulator) transfers motion from the electric window motor to the glass. It ensures smooth, consistent, and balanced movement of the window within the guide rails. Depending on your Porsche model, the system may use a cable-operated, scissor-type, or gear-driven design.

A correctly functioning window mechanism ensures:

  • Smooth and quiet window travel.
  • Secure sealing against wind and rain.
  • Reliable operation for ventilation and safety.

Why Do Window Mechanisms Fail?

Over time, window regulators can wear out due to repeated use, exposure to moisture, and mechanical stress. Common causes of failure include:

  • Broken cables or pulleys: Caused by corrosion or tension fatigue.
  • Worn plastic clips or guides: Often brittle with age or temperature changes.
  • Motor strain: Caused by a stiff or misaligned regulator.
  • Internal gear damage: Resulting in uneven or stuck window travel.

Signs of failure include grinding noises, slow window operation, or glass stuck halfway.

Why Replace Faulty Window Mechanisms?

A failing window mechanism compromises both comfort and safety. A window that won’t close properly can let in rain, reduce security, or fail an MOT test. Replacing a worn mechanism ensures:

  • Restored smooth window movement.
  • Improved cabin comfort and quietness.
  • Proper sealing and protection from elements.
  • Prevention of further motor or switch damage.

Design911 offers OEM-spec and genuine Porsche window mechanisms for an exact fit and long service life — the ideal solution to restore factory-quality operation and appearance.

 

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