| Blowing out refrigerant circuit |
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| In the case of vehicles on which the refrigerant lines have no threads for connection of adapters V.A.G -1785-, use is to be made, for example, for blowing out the individual components of a blow-out gun with rubber mouthpiece or an adapter from the VW/Audi passenger vehicle adapter set -VAS 6338/1-. Special care must be taken not to damage the connections (crushing or scratching) when using a blow-out gun with rubber mouthpiece. |
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| The evaporator is to be blown out by way of the connection for the low-pressure line (large diameter) after detaching the expansion valve or removing the restrictor. |
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| Always flush or blow out components in the direction opposite to refrigerant flow. |
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| Check expansion valve and renew if dirty or corroded. |
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| If dark, sticky deposits cannot be removed with compressed air, flush the components concerned with refrigerant R134a or renew. |
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| Thin, light grey deposits on the insides of pipes do not impair the function of the components. |
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| After flushing, always renew receiver or reservoir and restrictor. In the case of condensers fitted with a dryer cartridge in the integrated receiver, this cartridge is to be renewed. |
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| Depending on the version, receivers on which the dryer cartridge can be renewed separately may be provided with an additional filter element which may have to be renewed together with the dryer cartridge. |
| After blowing out the refrigerant circuit: |
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| Replacement compressors contain a certain specified quantity of refrigerant oil. For vehicles with two evaporators, it may be necessary to additionally add a certain quantity of refrigerant oil to the circuit → Heating, air conditioning; Rep. gr.87 or → Air conditioning; Rep. gr.87 (vehicle-specific workshop manual) and → Chapter (approved refrigerant oils and refrigerant oil capacities). |
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| If the air conditioner compressor is not to be renewed, the refrigerant oil quantity in the air conditioner compressor must be topped up in line with the specified capacity (pour out refrigerant oil and add the specified quantity to the air conditioner compressor or the refrigerant circuit again) → Chapter (renewing refrigerant circuit components) and → Chapter (approved refrigerant oils and refrigerant oil capacities). |
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