Buy 2007 Audi S4 Cap. Reservoir. Engine Coolant Expansion Tank - Repair or Replace A failed Expansion, Inverter, TT - OEM Audi Part # 3B0121321 (3B0-121-321)

A cover that prevents foreign debris from entering the container. Cap for the Hybrid Inverter Coolant Reservoir. Includes: Expansion Tank Cap Seal. Location-Auxiliary Reservoir. Location-Primary Reservoir. Location-Reservoir. Radiator Cap. To 09/30/2013. Cover. Drive Motor Inverter Coolant. Engine Coolant. Expansion Tank. Radiator. Included with: Reservoir.

Radiator CapEngine Coolant Reservoir CapDrive Motor Inverter Coolant Reservoir Cap

Engine Coolant Expansion Tank - Repair or Replace
A failed expansion tank can cause the cooling system in your 2007 Audi S4 to leak antifreeze, or it can cause your engine to overheat. If you're losing coolant, contact our service department to avoid engine damage.