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| Use only O-rings that are resistant to refrigerant R134a and related refrigerant oils. O-rings are no longer colour-coded. Coloured and black O-rings are used. |
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| Check that the O-rings used have the correct internal diameters. |
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| Before fitting a seal, coat it lightly with refrigerant oil (PAG oil). |
Note | t
| When purging components with compressed air and nitrogen, always collect the gas mixture exiting the component with suitable exhaust gas extraction equipment (workshop fume extractor). |
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| After completing repair work, screw sealing caps (with seals) onto valve and service connections. |
| Before operating the air conditioning system. Check the vehicle-specific charge quantities → Rep. gr.87. |
| Do not top up a charged refrigerant circuit; discharge refrigerant present and recharge system. |
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