4M0 121 447 BC · Coolant hose Audi genuine (OEM) part number 4M0 121 447 BC, Coolant hose. Fitted on (3)HOSE — pos 10 (KAT429.BIN)HOSE — pos 18 (KAT595.BIN)HOSE — pos 10 (KAT859.BIN) Open the interactive exploded diagram →