Audi Seat Skoda VW Golf MKV Coolant Flange Thermostat Housing Flange 038121132D

Audi Seat Skoda VW Golf MKV Coolant Flange Thermostat Housing Flange is a component from the Thermostats and housings category, designed for the cooling system of gasoline engines in Volkswagen Group vehicles. It is responsible for the stable routing of coolant in the thermostat area, which translates into the correct operating temperature of the power unit and safe operating conditions.

Specifications and technical data

• SKU: 038121132D
• Mark: Volkswagen
• Condition: Used
• OEM Part Number: 038121132D
• Substitutable numbers: 038121132D, 038 121 132 D
• Fuel type: Petrol
• Category: Thermostats & Housings

Function of the flange in the cooling system

The coolant flange thermostat housing plays a key role in precisely directing the flow of coolant between the engine block and the thermostat. In vehicles such as the fifth-generation Golf and selected Audi, Seat, and Skoda models, a properly selected flange ensures:

• stable maintenance of the gasoline engine's operating temperature,
• proper cooperation with the thermostat and cooling channels,
• reduced risk of engine overheating,
• a tight connection for cooling system hoses.

Purpose and vehicle compatibility

The presented flange is an original Volkswagen Group component, which means it retains factory geometry, mounting points, and connection diameters. As a result, the part is structurally prepared for use with gasoline engines found in the Golf MKV-related platform and selected Audi, Seat, and Skoda models where the manufacturer specified this thermostat housing configuration.

Component selection should always be verified by the OEM number and specific vehicle data (model, production year, engine type) to ensure full compatibility with the existing cooling system and to avoid installation issues.

Component characteristics and advantages

As a part from the Thermostats and housings category, the coolant flange works directly with the thermostat, temperature sensors, and coolant hoses. Using an original Volkswagen Group solution allows for maintaining:

• factory coolant routing in the thermostat housing area,
• proper positioning of the flanges relative to other engine accessories,
• compatibility with standard clamps and rubber hoses,
• consistency with the cooling system operating parameters specified by the manufacturer.

The item is a salvaged part, which in practice means an advantageous combination of an attractive price and the preservation of the original design. For many users, this is a technically sound choice when servicing the cooling system in older gasoline vehicles.

Professional installation and operation

Before installation, it is recommended to inspect the sealing surfaces, sensor sockets, and the condition of the connections for any mechanical damage. During replacement, it is worth:

• checking the condition of the thermostat and coolant hoses,
• using new seals in accordance with the manufacturer's recommendations,
• bleeding the cooling system after refilling with fresh coolant,
• verifying the absence of leaks after reaching operating temperature.

Such an approach minimizes the risk of needing to re-intervene in the cooling system and helps maintain stable operating conditions for the gasoline engine during daily use.

If you are planning a comprehensive repair or upgrade of the cooling system area in your Volkswagen and need other components from the same group, such as housings, inserts, or thermostat connectors, check the available parts in the Volkswagen Thermostats and housings category.

For drivers considering a wider range of service work on the power unit or drivetrain and who want to take an informed approach to salvaged parts, an expert guide discussing facts and myths about used components may be helpful – you can find it in the article Why it is worth buying used gearboxes and engines – facts instead of myths.