| Components of the refrigerant circuit leaking or damaged - the refrigerant circuit is absolutely empty |
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| If it is only a minor leakage and the refrigerant has creepingly escaped, the loss of the refrigerant oil and the penetration of humidity have nearly no influence on the function of the air conditioning system. |
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| Only carry out the work steps marked with an * for major leaks (e.g. after an accident). |
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| Remove the defective component and replace it. |
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| If dirt penetrated into the AC compressor when the refrigerant circuit was opened (e.g. during an accident), the AC compressor must be replaced.* |
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| Remove the oil drain plug from the AC compressor (replace O-ring → Electronic Catalogue of Original Parts) and drain oil. In order to speed up the evacuation of the refrigerant oil, turn the AC compressor with the clutch disk of the magnetic coupling by hand (disposal of used oil → Chapter).* |
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| Subsequently fill new refrigerant oil into the AC compressor (if it is not replaced). The oil quantity and the oil type correspond to the refrigerant oil volume in the new AC compressor, see → Heating, Air Conditioning → Rep. gr.87.* |
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| Flush the refrigerant circuit with the refrigerant R134a, if this is not possible, blow through with compressed air and then with nitrogen → Chapter.* |
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| Replace catch pan and throttle/fluid reservoir with dessicator (or only dessicator, specifically designed for vehicles) → Chapter. |
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| Assemble the refrigerant circuit, evacuate and fill again. |
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| Check the function of the air conditioning system. |
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