#3. 2.5 LITER. A Coolant Hose that feeds Coolant back to the overflow or recovery bottle in a closed loop Cooling system. Engine Coolant Bypass Hose. Hoses carries permanent Coolant, or antifreeze, throughout the Engine, heater, and radiator. Bypass. Overflow. Water BY - Passenger,. Reservoir. Included with: Hose & tube assembly.