VW Transporter T5 2.0 TDI CAAA Sealing Flange Temperature Sender 03L121131K

VW T5 2.0 TDI CAAA Water Flange Pipe Temperature Sensor is a component from the Cooling System Hoses and Pipes group, designed for Volkswagen diesel engines. It is responsible for precise coolant flow and cooperation with the temperature sensor, which is crucial for the stable operation of the Diesel engine unit.

Specifications and technical data

• SKU: 03L121131K
• Mark: Volkswagen
• Condition: Used
• OEM Part Number: 03L121131K
• Substitutable numbers: 03L121131K, 03L 121 131 K
• Fuel type: Diesel
• Category: Coolant Hoses

Function in the Diesel Engine Cooling System

The flange with the water pipe and a place for the temperature sensor operates in a critical area of the coolant circuit. The appropriate shape of the flow channel allows for stable heat dissipation from the engine, and the integrated sensor socket ensures reliable temperature readings for the engine control unit.

For 2.0 TDI Diesel units, proper coolant circulation is particularly important due to high thermal loads. A functional water flange pipe minimizes the risk of local overheating, leaks, and incorrect temperature indications, which could lead to limp mode or performance reduction.

Original Volkswagen Component – Fit and Integration

This element comes from the Volkswagen line, meaning it retains the factory geometry of connections, diameters, and mounting points. Thanks to this, the water flange pipe with the temperature sensor integrates with other cooling system components without the need for modifications, and installation is predictable and repeatable.

The original design ensures:

• compatibility with the factory coolant hose routing,
• correct positioning of the temperature sensor relative to the fluid flow,
• easier diagnosis of potential future leaks.

Performance Characteristics of a Used Component

The presented water flange pipe with temperature sensor is a used part, allowing for economical repair of the cooling system while maintaining original specifications. A used component of this type is particularly attractive for vehicles used intensively, where a reasonable service cost is important while maintaining correct functionality.

Choosing a used part from the Cooling System Hoses and Pipes group is a good solution when the existing flange has suffered mechanical damage, corrosion, or thermal deformation, and you want to maintain the factory hose routing and proper cooperation with the engine electronics.

Importance of Proper Cooling – Service Knowledge

To better understand the impact of components such as flanges, water pipes, and temperature sensors on engine durability, it is worth consulting technical materials. A practical discussion of common overheating problems and the role of individual components can be found in the article Engine Cooling System – Overheating, Repair, and Used Radiators, which shows how to properly diagnose and service the cooling circuit.

Expanding the Cooling System in a Volkswagen

If you are planning a comprehensive repair or upgrade of the engine area in your Volkswagen and need other parts from the same group, such as additional hoses, connectors, or flexible hose sections, check the available parts in the Volkswagen Cooling System Hoses and Pipes category.

Summary

The VW T5 2.0 TDI CAAA Water Flange Pipe Temperature Sensor is a practical choice for Diesel engine users who want to restore proper coolant circulation and reliable temperature measurement without deviating from Volkswagen's factory solutions. Using an original used part helps maintain cooling system integrity, reduce the risk of overheating, and optimize service costs while maintaining a professional repair standard.