Check Valves
WARNING: This page is about a different car, the 2023 Audi S3, 2023 Audi RS 3, 2023 Audi A3 Quattro, and 2023 Audi A3. However, it is still accessible from the selected car via links, so may be relevant.
The check valves separate the refrigerant circuit in different areas.
NOTE:
For example, the illustrated check valve -3- is installed on an Audi Q7 e-tron.
The check valves in the refrigerant circuit have a specified residual pressure (approximately 0.1 bar (1.45 psi) or 100 mbar (1.45 psi)) in the flow direction. So that the refrigerant circuit can be completely evacuated (residual pressure less than 5 mbar (0.07 psi)), all electrically activated valves must be opened.
Depending on the version, the flow direction may be marked with a sticker.