ACI 84890 Window Regulator - Rear Left

Rear Left Power Window Regulator for BMW X3

Restore smooth rear window movement with this ACI Window Regulator 84890 for the rear left position. It is a new power window regulator that meets or exceeds OEM requirements and is built for direct-fit service on the BMW X3.

Compatible with 2004-2010 BMW X3 rear left applications, this ACI 84890 window regulator is a practical replacement when the original regulator no longer raises or lowers the glass correctly. The ACI Window Regulator line focuses on replacement parts for door and window service, and this unit follows that approach with OE-style fit and function.

Key Features

• Fits 2004-2010 BMW X3, rear left
• Power window regulator design
• New replacement part
• Meets or exceeds OEM requirements
• Motor not included
• Mounting hardware not included
• Direct replacement for ACI 84890
• Cross-reference: Continental WR40066

Detailed Description

ACI 84890 is a rear left power window regulator for the BMW X3, engineered as a new replacement for the original door glass lifting mechanism. It is intended for 2004-2010 BMW X3 models with power window operation at the rear left door. If the window binds, drops, moves unevenly, or stops responding, this regulator provides the core mechanical repair needed to restore normal operation. This part cross-references Continental WR40066 for the same application.

Common Repair Symptoms

• Rear window will not move up or down
• Window drops into the door
• Slow, uneven, or noisy window travel
• Regulator cable or track failure
• Intermittent power window operation

Installation Notes and Tips

Verify rear left fitment before installation on the BMW X3. Transfer or reuse any required components not supplied with the regulator, since the motor is not included and mounting hardware is not included. Inspect the window glass, guides, and electrical connector condition before reassembly to help ensure proper operation after replacement.

Quality Assurance

This ACI Window Regulator 84890 is a new part that meets or exceeds OEM specifications for the listed BMW X3 application. Confirm the vehicle year and rear left door position against the fitment data before ordering.