Citroën C3 left front window retractor mechanism 400616 9221AQ

Description

CITROEN C3 left front window lowering mechanism, the first model with the function of Sequential closing
Driver’s door

Part description

This used left front window winder mechanism is for Citroën C3 (first model) and supports sequential coast down function. This is a part for the driver’s door, suitable as a replacement in the event of a pulling fault – typically when the window does not move smoothly, gets stuck, moves down crookedly or does not respond at all.

The advantage is the availability according to the exact part numbers – if the markings match, the replacement is a quick and economical solution without unnecessary compromises.

Technical information

• Manufacturer: Stellantis (Citroën / Peugeot)
• Model: Citroën C3
• Other numbers: 400619, 963912, 9221AQ, 1689040180

Product codes

• Product codes: 963912, 9221AQ

Installation recommendations

Generally/typically for the window retracting mechanism, the exact steps may vary depending on the door design and fittings (e.g. type of retracting motor, glass guide). Below is a practical procedure used when replacing this type of part.

1) Before assembly

• Compare the new and original mechanism: shape, mounting, cable/bowden system routing, position of stops and connectors (if part of the assembly).
• Check that the mechanism is not mechanically deformed and that the guide parts move without stuttering.
• Verify compliance with codes 963912 / 9221AQ (or other numbers listed).

2) Necessary tools and materials

• Set of screwdrivers and bits (common types for removing upholstery)
• Plastic crowbar for upholstery
• Gola set / keys according to the used connecting material
• Flashlight
• Detergent and rags (for cleaning the wiring and the door area)
• Suitable lubricant for guide rails (according to service practices)

3) Step-by-step assembly procedure

1. Turn off the ignition and disconnect the battery for safety reasons.
2. Remove the door trim/upholstery and release the covers to gain access to the mechanism.
3. Carefully disconnect the connectors related to the window control (if present) and free the grommets/wiring so that they are not in the way.
4. Remove the protective film/cover from the inside of the door so that the mechanism can be worked on (make sure it seals well later).
5. Release the glass attachment to the mechanism holder and secure the glass safely away from the tension of the mechanism.
6. Dismantle the original window pull mechanism from the door (release the attachment points gradually).
7. Clean the door area and check the guides, seals and glass tracks – dirt and hardened grease often cause overloading.
8. Install the new mechanism in the door, seat it in the correct position and fasten it.
9. Place the glass back into the mechanism holder and check that it sits straight and without tension.
10. Plug in the connectors (if included) and temporarily test the basic movement of the window (while maintaining work safety).
11. Put back the protective film/cover on the inside of the door and fit the door panel including all the handles and covers.

• 4) Post-assembly checks and test drive/function verification

  • Verify the smooth operation of the window in its entire range and the correct landing in the upper position.
  • Check if the window is crossing and making unusual noises when moving.
  • Check the sequential coastdown function (if it is active in the given configuration).
  • After driving, check that water/wind does not penetrate the door (film and upholstery correctly fitted).

  5) The most common assembly errors + how to avoid them

  • Unsecured glass during disassembly: risk of falling and damage – always fix the glass.
  • Bad seating of the glass in the holder: causes crossing and overloading – check alignment before tightening.
  • Ignoring stiff lines: the new mechanism is under unnecessary stress – clean and treat the lines lightly.
  • Damage or poor sealing of the film: risk of moisture in the interior – return the film carefully.

  Reasons why the part is damaged

  • Wear of cables and pulleys (for cable mechanisms) – fraying, skipping or seizing.
  • Dry/clogged glass guide and increased resistance – the mechanism is overloaded for a long time.
  • Intrusion of moisture into the door and corrosion of metal parts.
  • Incompetent handling (forcibly closing the window, prying the glass, bad installation after repairing the door).
  • Fatigue cracks of plastic sliders/grips due to age and vibration.