Freightliner Coolant Tube. Freightliner FLD Upper Coolant Tube Stainless Steel Detroit 60 OE# A0512855000. Lower Radiator Coolant Tube Freightliner FLD Detroit 60 A05-16601-000 Stainless. Freightliner Upper Coolant Tube Stainless Steel Fits Cummins N14 OE# A0516749000.