Volvo V40 Mk3 Rear Door Window Motor Left N/S Electric Window Regulator 31378400

Volvo V40 Mk3 Rear Door Window Motor Left N/S Electric Window Regulator is an original component from the Window regulators and motors group, designed for the precise operation of the rear left window in the third-generation Volvo V40. This used OEM component ensures a perfect fit with the factory door mechanism, stable window operation, and the preservation of electric control functionality.

Specifications and technical data

• SKU: 31378400
• Mark: Volvo
• Condition: Used
• OEM Part Number: 31378400
• Substitutable numbers: 31378400, E0274C
• Location on the vehicle: Rear, Left
• Part type: Window Motor
• Category: Window Motors & Regulators

Purpose and function in the vehicle

The presented electric window regulator is responsible for the smooth raising and lowering of the rear left window in the Volvo V40 Mk3, working in conjunction with the electrical system and factory switches in the door and console. Its placement in the rear left door area means this component has a direct impact on the comfort of rear-seat passengers and the proper closing of the window while driving and when parked. The motor operates in a system with the window guide mechanism, providing the appropriate torque and stable glass movement within the guides. Thanks to the OEM design, the correct operating geometry is maintained, which reduces the risk of jamming, excessive play, or uneven closing.

Construction and fitment for Volvo V40 Mk3

The electric window regulator has been designed specifically for the door architecture of the third-generation Volvo V40, taking into account factory mounting points and electrical connectors. This means:

• a compatible motor housing shape and mounting points relative to the door panel,
• a dedicated electrical connector matched to the wiring harness in the V40 Mk3,
• operating parameters consistent with the factory window control on the rear left side. As a result, installation is similar to replacing a factory component, without the need for wiring modifications or custom adapters. Original Volvo origin helps maintain the consistency of the entire window lifting system.

Benefits of using a used window motor

Choosing a used electric window regulator for the Volvo V40 Mk3 allows for a significant reduction in repair costs while maintaining the proper technical standard. The OEM component is factory-matched to the specific model, which minimizes the risk of compatibility issues typical of aftermarket parts with universal designs. A used component from the Window regulators and motors group is a particularly advantageous solution for maintenance repairs, where only the window drive is damaged while other door components remain functional. This allows for the restoration of full window control functionality without the need to interfere with other sub-assemblies.

Professional selection and installation

To ensure proper system operation, it is worth verifying the component's compatibility with the specific vehicle equipment version before installation, using OEM markings and Volvo catalog data. A correctly selected window motor works with factory comfort controllers, maintaining functions such as smooth closing or one-touch operation (if present in the given configuration). During installation, it is recommended to check the condition of the window guides, seals, and the electrical harness in the door. Careful installation and correct adjustment of the mechanism reduce the load on the motor, which translates into a longer service life for the entire system. If you are planning a comprehensive repair or upgrade of the door and window area in your Volvo and need other elements from the same group, such as drives, guide mechanisms, or control modules, check the available parts in the Volvo Window regulators and motors category.

More about the cost-effectiveness of used components

When choosing a used window motor for the Volvo V40 Mk3, it is worth knowing the general principles of selecting parts according to manufacturer markings and the real cost differences between new and used components. A detailed discussion of these issues, along with practical examples and verification procedures, can be found in the article Why it is worth buying used gearboxes and engines – facts instead of myths, which helps in making an informed decision when purchasing original dismantled components.