#4. 2.0 LITER. Hose assy. LEFT. PartQualifier: #4. Auxiliary Radiator. Flexible Hose that is part of the engine cooling system. Pipe that is part of the engine cooling system. and Amplifier; Assembly. Center. Connector Pipe. Cross. Engine Coolant Pipe. Radiator Coolant. Vent Pipe. Water inlet. Water retrn.