| Because of humidity which has penetrated (the refrigerant circuit was opened over a longer period of time) (e.g. after an accident) or inner damage on the compressor |
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| Empty the refrigerant circuit with the aid of the A/C service station. |
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| Remove the air conditioning compressor. |
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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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| Check expansion valve for dirt or corrosion, replace if necessary. |
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| Replace catch pan and throttle/fluid reservoir with dessicator or only dessicator (specifically designed for vehicles). |
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| If the AC compressor is not replaced: |
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| Unscrew the oil drain plug from the removed 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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| Fill the volume of new refrigerant oil, which corresponds to the refrigerant oil volume in the original part AC compressor, into the removed AC compressor → Heating, Air Conditioning → Rep. gr.87. |
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| If the AC compressor is replaced: |
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| A new original part compressor is filled with a refrigerant oil volume required for the complete refrigerant circuit. |
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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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