1J0 121 321B: Expansion tank for Audi A3 (8L), Volkswagen Golf 4 and Bora

This coolant expansion tank is intended for the Audi A3 (8L) as well as Volkswagen Golf 4 and Bora, in all petrol and diesel versions, with the exception of cabriolets. As part of the restoration or maintenance of a classic vehicle, replacing the expansion tank helps maintain the integrity of the cooling circuit and prevent any engine overheating. A faulty component can indeed cause fluid loss and compromise the reliability of the entire thermal system. Having a tank in good condition is therefore an essential prerequisite for driving with peace of mind in these models.