Perform a Leak Detection Test on a Refrigerant Circuit That Is Filled with Refrigerant:

-- Switch off the ignition.

-- Start up the leak detector in line with relevant operating instructions.

-- Always hold the test probe underneath the suspected leak.

Fig 1: A/C Refrigerant System, Checking For Leaks

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

Depending on the model, leak detection is indicated by an increase in clicking rate or a warning tone. Refer to the Leak Detection Device Owner's Manual.

NOTE:

Currents of air quickly disperse refrigerant gas. Drafts must therefore be avoided during leak detection.

Refrigerant gas is heavier than air and will escape.