General Information For Finding Leaks On The Refrigerant Circuit

WARNING: This page is about a different car, the 2022 Volkswagen ID.4 and 2021 Volkswagen ID.4. However, it is still accessible from the selected car via links, so may be relevant.

Volkswagen does not approve the use of chemical substances (leak detection additives) to locate leaks in the refrigerant circuit.
Small leaks can be detected, for example, by using a leak detection spray together with an external pressure test.
Many methods for detecting leaks in the refrigerant circuit are offered in the open market. These methods do not always have clear results and if they are not performed exactly to the specification may show several components in the refrigerant circuit as having leaks which do not. Also, refrigerant circuit components can be damaged by some methods.
Do not repair components that are leaking; always replace them.
Do not charge a leaking refrigerant circuit with refrigerant for this reason evacuate the refrigerant circuit and check it for leaks at the same time before charging. Refer to REFRIGERANT CIRCUIT, EVACUATING .

Volkswagen does not approve the use of chemical substances (stop leak additives) to seal leaks in the refrigerant circuit.
Chemical substances used to seal leaks, form deposits in the refrigerant circuit, which affect the A/C system function and cause the A/C system (and its A/C Service Station) to malfunction.
Chemical materials to seal leaks in the refrigerant circuit react with air or the moisture in the air and form deposits in the refrigerant circuit (and the A/C Service Station) that lead to malfunctions in the valves and other components that come into contact with such chemicals. These deposits cannot be removed completely from the components, even by cleaning/flushing. It is only possible to service the refrigerant circuit by replacing all the components that have come into contact with this material.