#2 to ENG #180117Y0140PT204. 2.0 LITER GAS. Air hose. MAIN. A pipe that transfers compressed air to from the turbo or super charger to the intercooler. Hoses carries permanent coolant, or antifreeze, throughout the engine, heater, and radiator. BY Passenger. Charge Air Cooler Pipe. Engine Coolant. Intercooler Pipe.