| Drain the refrigerant circuit with the A/C service station |
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| The refrigerant circuit must be drained if parts of the refrigerant circuit are removed, in case there is any doubt about the volume of refrigerant in the circuit or when required according to the safety measures. |
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| Depending on the type of the selected A/C service station, variations can occur in the work procedure. |
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| The work procedure must always be carried out as described in the operating instructions of the selected A/C service station. |
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| Connect the A/C service station to the service connections according to the relevant operating instructions (see refrigerant circuit specifically designed for vehicles) and operate it. |
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| It cannot be excluded that some refrigerant oil is suctioned out of the refrigerant circuit together with the refrigerant. In order to ensure the lubrication of the AC compressor, the refrigerant oil volume in the circuit must be topped up with fresh oil → Heating, Air Conditioning → Rep. gr.87. |
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| On vehicles with an AC compressor without magnetic coupling (with regulating valve for compressor of air conditioning system -N280-) the engine should run with an empty refrigerant circuit for a relatively short period of time (max. 10 minutes), thus a high engine speed must be avoided (the AC compressor keeps on running) see → Chapter. |
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| On vehicles with an AC compressor with magnetic coupling, the air conditioner pressure switch -F129- or the high pressure sender -G65- switches off the magnetic coupling as soon as the refrigerant is in the refrigerant circuit. |
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| The engine must only be started if the refrigerant circuit is correctly assembled. |
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