Tiguan Expansion Tank - 2016-24 - 2.0 TDI

Replacement coolant expansion tank for selected Volkswagen Arteon and Tiguan diesel models fitted with 2.0 TDI engines. This coolant reservoir is designed to maintain correct coolant expansion and circulation within the cooling system while helping remove trapped air and maintain proper system pressure.

The expansion tank plays a vital role in the engine cooling system by storing expanding coolant as engine temperatures rise and returning coolant back into the system as temperatures fall. A properly functioning expansion tank helps prevent coolant loss, overheating and cooling system pressure issues.

Over time the original plastic coolant bottle can become brittle or crack due to repeated heat cycles and pressure changes. Common signs of failure include coolant leaks, coolant smells, low coolant warnings or visible cracks around the hose fittings and seams.

This replacement expansion tank is supplied without the pressure cap and is suitable for a range of Tiguan AD1, Tiguan Allspace and Arteon diesel applications.

Specifications:
• Coolant expansion tank / reservoir
• Supplied without cover/cap

Replaces OE Part Numbers:
• 3Q0121407
• 3Q0121407A

Fitment:

VW Arteon Hatchback (2017-2020)
• 2.0 TDI 150PS
• 2.0 TDI 190PS
• 2.0 BiTDI 240PS

VW Tiguan AD1 SUV (2016-2024)
• 2.0 TDI 110PS
• 2.0 TDI 115PS
• 2.0 TDI 122PS
• 2.0 TDI 143PS
• 2.0 TDI 150PS
• 2.0 TDI 177PS
• 2.0 TDI 190PS
• 2.0 TDI 200PS
• 2.0 BiTDI 240PS

VW Tiguan Allspace SUV (2017-2020)
• 2.0 BiTDI 240PS

Additional Parts That May Be Required During Fitting:
• Expansion tank cap
• Fresh G12 EVO / G13 coolant
• Coolant hose clips
• Coolant level sensor seal if fitted