Dorman 740-478 Window Regulator - Front Left

Reliable Electric Window Regulator for BMW 5 Series

The Dorman 740-478 window regulator is designed specifically for BMW 525i, 528i, 530i, 540i, and M5 models. This electric window regulator offers a bolt-on attachment type and a durable metal and plastic frame to ensure smooth window operation without the motor included.

Key Features of Dorman 740-478 Window Regulator

• Compatible with BMW 525i, 528i, 530i, 540i, and M5 models
• Electric window operation type for seamless control
• Bolt-on attachment type for straightforward installation
• Durable metal and plastic frame materials for strength and longevity
• Plastic gear material designed for smooth movement
• Package includes one power regulator without motor or mounting hardware

Detailed Product Description

The Dorman 740-478 window regulator is engineered to replace the electric window regulator in select BMW 5 Series vehicles, including the 525i, 528i, 530i, 540i, and M5. Featuring a combination of metal and plastic frame materials, this part balances durability with lightweight design. The plastic gear material ensures quiet and efficient window movement. This regulator is designed for bolt-on installation, making it a practical choice for professional repairs or experienced DIY enthusiasts. Note that the motor and mounting hardware are not included, allowing for compatibility with existing components.

Common Issues Addressed by This Window Regulator

• Window glass failing to move up or down smoothly
• Intermittent or non-functional electric window operation
• Grinding or unusual noises during window movement
• Loose or unstable window glass alignment
• Broken or worn-out window regulator components

Installation Notes and Tips

• Ensure compatibility with BMW 525i, 528i, 530i, 540i, or M5 before installation
• Requires bolt-on attachment; verify existing mounting hardware condition
• Motor not included; reuse existing motor or purchase separately if needed
• Installation instructions are not included; professional installation recommended if unfamiliar with window regulator replacement

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit and function. While this window regulator does not include a motor or mounting hardware, it is built with quality materials such as metal and plastic frames and plastic gears to ensure reliable performance. Please consult the product packaging or Dorman’s official resources for specific warranty details related to part number 740-478.