Freightliner Coolant Tube. Lower Radiator Coolant Tube Freightliner FLD Detroit 60 A05-16601-000 Stainless. Upper Coolant Tube Fits Freightliner FLD C15 Stainless Steel A05-15980-000. Lower Coolant Tube Fits Freightliner 3406E C15 A0515785000 Stainless Steel.