| Repair work on refrigerant circuit which may be performed only in appropriate workshops by specially trained mechanics |
WARNING | Danger of freezing injuries. |
| If refrigerant circuit has not been evacuated, refrigerant and refrigerant oil will escape. |
| Extract refrigerant before opening refrigerant circuit. If the refrigerant circuit is not opened within 10 minutes after it has been evacuated, pressure may develop in coolant circuit due to re-evaporation. Extract refrigerant again. |
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| The refrigerant circuit must be purged with refrigerant R134a under the following circumstances: |
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| If dirt or other contamination is in the circuit. |
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| If during the evacuation of a leak-tight refrigerant circuit the vacuum is not maintained at the gauge (there is moisture in the refrigerant circuit and this generates pressure). |
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| If the refrigerant circuit has been left open for longer than normally required for repairs (e.g. following an accident). |
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| When pressure and temperature measurements in the refrigerant circuit indicate that there is moisture in the refrigerant circuit. |
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| There is doubt about the amount of refrigerant oil in the refrigerant circuit. |
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| The air conditioner compressor has to be exchanged because of internal damage (e.g. noisy or lack of power). |
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| In vehicles with start-stop system, note abort conditions → Chapter. |
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