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64 50... Leak-testing with leak tester device

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2010 BMW 528xi, 2010 BMW 528i, 2009 BMW 528xi, 2009 BMW 528i, and 2008 BMW 528xi. However, it is still accessible from the selected car via links, so may be relevant.
WARNING: Risk of injury!
Refrigerant circuit is under high pressure!
Follow safety instructions for handling R 134a refrigerant.  
Avoid contact with refrigerant and refrigerant oil.
Follow safety instructions for handling refrigerant oil.  
IMPORTANT: Risk of damage!
Restart engine only when A/C system has been correctly filled.
Follow instructions  for opening and replacing parts in refrigerant circuit.
If A/C system is opened for more than 24 hours:
Replace desiccant insert for A/C system

Necessary preliminary tasks: 

Carry out leak-testing with a leak tester device from the workshop equipment catalogue following the device manufacturer's operating instructions.

If leaks not to be localized are already identified during evacuation, the A/C system must nevertheless be filled  . Then test for leaks with leak tester device.

NOTE: Refrigerant is heavier than air.
Therefore always conduct the leak test below the lines and components to be tested.
Shield lines and components against strong blasts of air (wind, drawing off).

Tighten down loose lines, mark leaks.

Then draw off draw off  A/C system and seal off or repair leakage points.

Then refill  A/C system and test for leaks.