| Connecting air conditioner service station for measuring and testing |
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| Work procedure may vary depending on the type of tools selected; therefore it is important to observe the tool-specific operating instructions. |
Note | The work procedure must always be performed as described in the operating instructions of the air conditioner service station. |
| To prevent air or moisture entering the refrigerant circuit through the charging hoses, these are to be connected as follows: |
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| Connect air conditioner service station to power supply. |
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| Evacuate the charging hoses if necessary. |
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| Connect quick-release coupling to service connection of refrigerant circuit. |
WARNING | Do not open the valves on the low or high-pressure end with the engine running, as otherwise the air conditioner compressor or the air conditioner service station could be destroyed by a short circuit between the high and low-pressure ends of the refrigerant circuit if the air conditioning system is switched on. |
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| Only screw the handwheel into the quick-release coupling adapter to the extent required to reliably open the valve in the service connection (observe the pressure gauge; take care not to open the valve too far). |
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| Start the engine and perform the intended tests and measurements. |
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| Compare the values determined to the specified measured values → Chapter. |
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| Before detaching the quick-release coupling, close it by screwing out the handwheel. |
| Vehicles with one service connection only: |
Note | Screw the valve adapters -V.A.G 1785/9-, -V.A.G 1785/10- or the adapter set -V.A.G 1786- to the refrigerant circuit connections with valve and bleed the charging hoses during connection to the adapters (only a faintly audible escape of refrigerant gas is permitted) → Chapter. |
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| The charging hose must be fitted with a valve opener to open the valve in the valve adapter. |
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