General Information For Finding Leaks On The Refrigerant Circuit

NOTE:

Minor leaks can be detected using an electronic leak detector or UV leak detector lamp.

This Service Information describes two different methods for detecting leaks in the refrigerant circuit. These methods have been tested and result in success when used correctly.

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 with leaks; 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 .

NOTE:

VW/Volkswagen/Audi does not approve the use of chemicals to seal leaks in the refrigerant circuit (leak stop additives).

Chemicals that seal leaks in the coolant circuit form deposits that affect the function of the A/C system and lead to failure of the A/C system (and the A/C service station).

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 which come in contact with this material.