Shop 2008 Audi A5 Engine Coolant Reservoir. 2.9 LITER, MAIN. 2.9 LITER, MAIN, from 09/07/2020. 3.0 LITER MAIN, LITER, Sportback - OEM Audi Part # 4K0121405AC (4K0-121-405-AC)

Tank. Reservoir. Engine Coolant. Expansion.
A container that holds Engine Coolant. Includes Cap.

Engine Coolant Reservoir

Fits A6, A6 allroad, A7, RS6, RS7, S6, S7

2.9 LITER, MAIN. 2.9 LITER, MAIN, from 09/07/2020. 3.0 LITER, MAIN, from 09/07/2020. A6 Allroad; From 9/7/2020. A6 Quattro; From 9/7/2020. A7 Sportback. From 09/07/2020. MAIN. MAIN, from 09/07/2020. RS6 Avant; From 9/7/2020. RS7 Sportback; From 9/7/2020. S6; From 9/7/2020. S7 Sportback; From 09/07/21.
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.