Working with A/C Service Station
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Important Notes
Observe the following with regard to A/C service station operation (e.g. V.A.G 1885) → Catalog V.A.G equipment :
- The filters and dryers installed must be replaced at the latest on completion of the service life specified in the relevant operating instructions.
- If an A/C service station is also used for flushing the refrigerant circuit, dryer and filter must be replaced in shorter intervals → Refrigerant Circuit, Flushing with Compressed Air and Nitrogen .
- Exclusive use is to be made of refrigerant oils which have been approved for the vehicle-specific refrigerant circuit (if necessary, fill refrigerant oil directly into refrigerant circuit). → Electronic Parts Catalog ETKA
Extracted refrigerant is not to be reused if there is any doubt about the composition of the refrigerant extracted, even after cleaning in the A/C service station.
- The A/C service station is to be drained in all these cases → A/C Service Station, Connecting , the system cleaned if necessary and the filters, dryers and refrigerant oil replaced.
Commercially available A/C service stations can be classified in 2 groups:
- A. A/C service stations which clean extracted refrigerant for re-use (so-called extraction and recycling stations), e.g. V.A.G 1885 (currently available A/C service stations → Catalog V.A.G tools )
- B. A/C service stations which transfer extracted refrigerant to recycling containers (for large-scale recycling). These are referred to as extraction systems.
Connecting for Measurement and Testing
- Work procedure may vary depending on the type of tools selected (the tool-specific operating instructions should therefore be followed).
NOTE:
- The work procedure is always to be performed as described in the operating instructions for the relevant A/C service station (e.g. V.A.G 1885).
The charging hoses are to be connected as follows to prevent the ingress of air or moisture into the refrigerant circuit:
- Switch off ignition.
- Connect A/C service station to power supply.
- Unscrew caps from service connections or connections with valve (refer to vehicle-specific refrigerant circuit) → 87 - Air conditioning .
- Evacuate charging hoses if necessary.
- Connect quick-release coupling to service connection of refrigerant circuit.
CAUTION:
- Never open valves on low or high-pressure side with engine running, as otherwise compressor or A/C service station could be destroyed by a short circuit between high and low-pressure sides of refrigerant circuit if air conditioning system is switched on.
NOTE:
- Screw valve adapters V.A.G /9 , V.A.G /10 or air conditioning adapter set V.A.G 1786 to refrigerant circuit connections with valve and bleed charging hoses during connection to adapters (faintly audible escape of refrigerant gas is permitted) → A/C Service Station, Connecting .
Vehicles with one service connection only:
- The charging hose must be installed with a valve opener for opening valve in valve adapter.
- Only screw handwheel into quick-release coupling adapter to the extent required to reliably open valve in service connection (observe pressure gauge; take care not to strain valve).
- Start engine and perform planned tests and measurements.
- Compare values determined to specified measured values → Refrigerant Circuit, Checking Pressures with A/C Service Station .
- Before disconnecting quick-release coupling, close it by screwing out handwheel.