Mercedes CLC CL203 Door Seal Sealing Frame Gasket Left N/S A2037200378

The Left Door Seal for Mercedes CLC CL203 is an original part from the door seals category, designed for installation on the driver's side. It ensures a tight seal of the door panel, reduces wind noise, and supports the proper functioning of the door lock and window.

Specifications and technical data

• SKU: A2037200378
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2037200378
• Substitutable numbers: A2037200378, A 203 720 03 78
• Location on the vehicle: Left
• Category: Door Seals

Purpose and Function of the Door Seal

This seal is designed for the Mercedes CLC CL203 body and is mounted on the left side of the vehicle. It is responsible for the airtightness of the door perimeter, stable door panel guidance, and preventing water, dust, and air drafts from entering the cabin.

A properly fitted door seal contributes to:

• noise reduction at higher speeds,
• protection of sills and lower door edges from moisture,
• stable door closing without excessive force,
• maintaining acoustic comfort inside the vehicle.

Original Mercedes Fitment

This seal comes from the Mercedes range, ensuring it retains the factory geometry and profile characteristic of the CL203 body. This means a precise fit to the door frame and bodywork, without the need for cutting or modifications. Original manufacturing helps maintain consistency with other body trim elements and minimizes the risk of leaks after installation.

The part is intended for installation on the left side of the vehicle, making it easier to select the correct seal for accident repairs or replacement of worn-out components.

Condition, Installation, and Application

The seal is in used condition, allowing for an economical repair while maintaining the original manufacturer's specifications. This is a practical solution for:

• replacement after a collision or bodywork/painting jobs,
• wear of the factory seal (cracks, loss of elasticity, leaks),
• issues with cabin noise or moisture appearing on the sills.

The seal is installed in the factory location, along the perimeter of the door, using the mounting points provided by the manufacturer. When properly seated, it can restore correct door operation and vehicle comfort.

Benefits of Using an Original Door Seal

Using an original left-side door seal for the Mercedes CLC CL203 helps maintain factory-like sealing and acoustic performance. This is particularly important in vehicles where everyday comfort and proper interior protection from external factors are crucial. Choosing a part from the same product line as the factory equipment reduces the risk of poor fitment, which is common with universal aftermarket alternatives.

If you are looking for other Mercedes door seals, check out our dedicated offer: Mercedes door seals.

More About Used Body Parts

When choosing a used door seal, it's beneficial to know the facts about the durability and cost-effectiveness of such solutions. If you want to better understand how to wisely purchase used body parts and debunk common myths, read our article: Used Car Parts: Myths and Facts You Need to Know.