Shop OEM Volkswagen Group Part # 8E0121321 (8E0-121-321). Cap. Reservoir. Cover. Engine Coolant. Radiator. 1.8 LITER. 2.7 LITER V6. 3.0 LITER. 3.0 LITER V6. 3.2 LITER. 4.2 LITER, 2004-06. 4.2

A Cover that prevents foreign debris from entering the container. Location-Reservoir. Radiator Cap.

Radiator CapEngine Coolant Reservoir Cap

Fits A4, A6, A7, A8, allroad, S4, S6, S8

1.8 LITER. 2.7 LITER V6. 3.0 LITER. 3.0 LITER V6. 3.2 LITER. 4.2 LITER, 2004-06. 4.2 LITER, 2007-10. 4.2 LITER, MAIN. 5.2 LITER, MAIN. 6.0 LITER, PRIMARY. A8. EXPANSION TANK CAP; A6. EXPANSION TANK CAP; S6. S8.
Engine Coolant Expansion Tank - Repair or Replace
A failed expansion tank can cause the cooling system in your to leak antifreeze, or it can cause your engine to overheat. If you're losing coolant, contact our service department to avoid engine damage.