Genuine 059 121 731D Coolant Return Pipe for 3.0L TDI Diesel

The Genuine 059 121 731D is an OEM coolant return pipe designed for Volkswagen and Audi vehicles equipped with 3.0L TDI diesel engines. This factory-engineered pipe plays a critical role in the closed-loop cooling system by routing coolant from the engine back to the expansion tank or recovery bottle, ensuring proper circulation and temperature regulation.

Key Features:

• Genuine Volkswagen AG part manufactured to OEM specifications
• Durable plastic construction designed for heat resistance and flexibility
• Direct replacement for damaged or deteriorating original coolant pipes
• Connects the expansion tank to the cooling system circuit
• Backed by 24-month factory warranty

Specifications:

• Part Number: 059121731D
• Supersedes: 059121731A, 059121731B
• Application: 3.0L V6 TDI diesel engines (rear center location)
• Weight: 0.04 lbs (0.02 kg)

This coolant pipe is essential for maintaining proper engine operating temperature. Over time, plastic coolant pipes can become brittle, crack, or develop leaks due to heat cycling and pressure fluctuations. Replacing worn pipes prevents coolant loss, overheating, and potential engine damage. As a genuine OEM component from the Volkswagen Group, this part ensures precise fitment and reliable performance.