Refrigerant Circuit Lines And Hoses
WARNING: This page is about a different car, the 2021 Audi S4 and 2021 Audi A4 Quattro. However, it is still accessible from the selected car via links, so may be relevant.
The mixture of refrigerant oil and refrigerant R134a corrodes certain metals (such as copper) and alloys and dissolves some hose materials. Therefore use original replacement parts only.
Lines and hoses are joined by threaded connections or special plug connectors.
NOTE:
Observe specified torque for threaded connections, use appropriate release tools for plug connectors.