General Information

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.

Ensure absolute cleanliness when working.
Wear safety goggles and gloves when working with refrigerant and nitrogen.
Workshop extraction systems are to be switched on.
Use the service station to discharge the refrigerant circuit, only then open screw connections and replace the malfunctioning components.
Use a cap to seal off any opened assemblies and hoses to prevent moisture and dirt from getting in.
Make exclusive use of tools and materials intended for refrigerant R134a.
Seal opened refrigerant oil containers to guard against moisture.

NOTE:

After engine all service work, screw sealing caps (with seals) onto all connections with valve and service connections.

Before starting up A/C system. Observe vehicle specific filling capacities. Refer to REFRIGERANT R134A CAPACITIES, REFRIGERANT OIL AND APPROVED REFRIGERANT OILS .

Do not fill refrigerant, extract the refrigerant present and refill the system.