Heat Exchanger Mercedes W177 W118 W247 Heater Radiator Matrix A2478304502

The Mercedes W177 / W118 / W247 Heater Core Heat Exchanger is an original cabin heating system component designed for Mercedes compact models. Thanks to its precise OEM construction, it ensures stable heat transfer, proper ventilation system operation, and thermal comfort inside the vehicle. This is a solution for users who expect factory fitment and predictable performance parameters for the heating system.

Specifications and technical data

• SKU: rhd-A2478304502
• Mark: Mercedes (Genuine OE)
• Condition: Used
• OEM Part Number: A2478304502
• Substitutable numbers: A2478304502, A 247 830 45 02
• Category: Heater Cores

Purpose and Function in the Heating System

The heater core heat exchanger is responsible for transferring thermal energy from the coolant circuit to the air directed into the cabin. In new-generation Mercedes A-Class, CLA, and B-Class models, its proper operation is crucial for:

• maintaining a stable interior temperature,
• efficient window defogging in humid conditions,
• uniform distribution of warm air through the ventilation ducts,
• maintaining the correct operating characteristics of the automatic climate control.

Thanks to its construction conforming to factory Mercedes standards, the exchanger works with original connectors, the heater housing, and the ventilation control system, which reduces the risk of leaks and installation problems.

Construction and Performance Parameters

As a component from the Heat Exchangers group, the heater core utilizes a dense network of channels and fins to achieve a large heat exchange surface area within compact dimensions. This design promotes:

• efficient air heating even at low outside temperatures,
• effective airflow through the core,
• maintenance of stable operating parameters at various fan speeds.

Original manufacturing ensures proper fitment with the heater housing and compatibility with the factory cooling system, which is particularly important in modern engines with precisely controlled operating temperatures.

Benefits of Using an Original Heat Exchanger

Using an original heat exchanger in a Mercedes heating system offers a range of practical operational benefits:

• Factory Fitment – no modifications required, compatibility with manufacturer-specified mounting points and seals.
• Stable Thermal Characteristics – predictable heating system behavior across the entire range of loads and temperatures.
• Optimal Airflow – appropriate airflow resistance, which reduces the load on the blower motor and contributes to quiet ventilation operation.
• Cooling System Compatibility – proper cooperation with the coolant circuit, reducing the risk of localized overheating or underheating.

For users who want to avoid problems with aftermarket part fitment, an original heat exchanger is a technically safe and predictable solution for long-term operation.

Condition, Verification, and Part Selection

This component is from the used parts category, allowing for an economical restoration of the heating system's efficiency while maintaining OEM specifications. Before installation, a standard check of the cooling system's tightness and verification of the condition of hoses and clamps are recommended to avoid secondary leaks after replacing the heater core.

When selecting a heat exchanger for a specific body version and engine, it is worth paying attention to compatibility with the manufacturer's part number and available replacement numbers. To better understand the principles of component selection and avoid mistakes when purchasing used parts, you can consult the expert advice described in the article how to professionally select used car parts and avoid wrong purchases.

Expanding the Mercedes Heating System

If you are planning a comprehensive repair or upgrade of the heating system area in your Mercedes and need other components from the same group, such as additional heaters, coolant radiators, or heat exchange modules, check the available parts in the Mercedes Heat Exchangers category.