CSF Auxiliary Radiator (AMG C63S W205)AMG C63S W205 CSF Auxiliary Radiator Note: if you require TWO CORES, add 2x quantity at checkout. The High Performance All Aluminium Auxiliary Radiators work in conjunction with the rest of the cooling system to reduce temperatures throughout. This is critical as the Auxiliary Radiators not only help keep engine water temperatures lower, but also are utilized as the heat exchange medium in the air to water charge air coolers for the turbocharger