Jetta CL, open the air conditioning, air conditioning box "Om, Om" vibration, increase the vibration shock, remove the evaporation box and found that the refrigerant through the expansion valve into four tubes into the evaporation box, and these four tube too close, When the refrigerant flows through the tube when the vibration of the sound of the sound, the four pipes separated from the sound disappeared.
     Jetta GiX, open the blast bucket issued by the smell of the nose, the inspection is air conditioning evaporator on the plastic wiping too much.
     Jetta GiX, open the heating, the wind blown out of the wind pungent smell, the cab appears water vapor, the inspection found that the heating tank leakage antifreeze, replace the heating tank troubleshooting.
     Jetta GiX, start the engine after the feeling of the instrument vibration and "despair, despair" slightly sound, open the hood, hand touch to the air box vacuum tube check valve vibration, because the valve inside the valve Closed lax, so the occurrence of vibration, replace the one-way valve vibration elimination.
     Jetta CT, open the front of the blower air outlet is not the wind, the inspection is the two control of the vacuum plate vacuum chamber leak.