Genuine OEM Volkswagen Coolant Additional Cooler, part number 7E0121212A. This auxiliary heat exchanger is a critical component of the engine cooling system, designed to provide additional cooling capacity to maintain optimal coolant temperature. It works in conjunction with the main radiator to prevent engine overheating, especially under demanding conditions. Constructed from durable aluminum, this cooler weighs approximately 2.19 kg and measures about 89.5 cm in length. Using a genuine OEM cooler ensures proper heat dissipation, precise fitment within the cooling system, and long-term reliability for engine protection.