TT Quattro Coupe L4-1.8L Turbo (BEA) (2003)
Hose/Line HVAC: Description and Operation
Hoses And Lines
The mixture of refrigerant oil (PAG oil) and refrigerant R-134a attacks some metals and alloys (for example, copper) and breaks down certain hose
material. Use only hoses and lines which are identified with the lettering "R-134a."
Hoses and lines are secured with threaded connections. Always properly torque hose and line connections.