Guidelines For Clean Working Conditions

WARNING: This page is about a different car, the 2022 Audi Q3. However, it is still accessible from the selected car via links, so may be relevant.

Even slight contamination can cause malfunctions for this reason when working on the A/C system pay attention to the following cleanliness regulations:

Immediately seal off any open lines and connections with clean plugs, for example taken from the Engine Bung Set :VAS6122 .
Place removed parts on a clean surface and cover them with lint-free cloths.
Carefully cover or seal opened components if repairs are not performed immediately.
Only install clean parts: remove the replacement parts from their packaging just before installing them. Do not use any parts that have been kept out of packaging (for example, in a toolbox).
Do not work with compressed air when the system is open.
Protect the disconnected connectors from dirt and moisture and only connect when they are dry.