1J0 121 321B : Coolant expansion tank for Volkswagen Golf 4 and Bora

This coolant expansion tank is designed for the Volkswagen Golf 4 and Bora, all petrol and diesel models, with the exception of Cabriolet versions. It ensures thermal compensation of the cooling circuit by absorbing volume variations of the fluid according to engine temperature fluctuations. As part of the restoration or maintenance of a classic vehicle, replacing this component helps maintain the integrity of the cooling system and prevent any risk of overheating. A reliable replacement part to preserve the mechanics of these iconic models.