Flushing Circuit Block Diagrams: Notes
The arrows in the following illustrations show the direction of refrigerant flow while flushing. During flushing, refrigerant flows in the opposite direction than during A/C system operation, therefore the high pressure side of A/C service station is connected to A/C compressor at low pressure side of refrigerant circuit.
These block diagrams indicate a refrigerant circuit with restrictor and reservoir and a refrigerant circuit with expansion valve, fluid reservoir and a second evaporator (optional equipment on certain vehicles)
Depending on the design of A/C service station, check-valves may be installed between refrigerant circuit and A/C service station. They guarantee the correct direction of refrigerant flow during flushing.
Refrigerant Circuit With Expansion Valve, Fluid Reservoir and Second Evaporator, refer to REFRIGERANT CIRCUIT WITH EXPANSION VALVE, FLUID RESERVOIR AND SECOND EVAPORATOR .
Flushing Circuit With E-Compressor, refer to FLUSHING CIRCUIT WITH E-COMPRESSOR .
Refrigerant Circuit with Restrictor and Reservoir
On vehicles with restrictor and reservoir, the restrictor and reservoir are removed. Restrictor refrigerant pipes are reassembled. Refrigerant pipes to the removed reservoir are connected with each other via two adapters and Charge hose VAS 6338/31 (from VW/Audi passenger vehicle set adapter chest VAS 6338/1).
- A/C Service Station
- With electronics and a flushing program, for example Robinair A/C Service Unit ROB134APF with Air Conditioning Flush Tool VAS6337/1A.
- If an A/C service station without a flushing program is used, the procedure must be performed manually (evacuate, flush 3 times with at least 4 kg refrigerant each and extract refrigerant again, evacuate).
- Refrigerant Hose Of A/C Service Station
- From high pressure side of A/C service station (mostly colored red) to low pressure side connection of A/C compressor on refrigerant circuit (larger diameter).
- Adapter To Connection For Low Pressure Side On Refrigerant Circuit
- Different versions depending on vehicle. Refer to ADAPTER FOR ASSEMBLING FLUSHING CIRCUIT .
- From VW/Audi passenger vehicle set adapter chest VAS 6338/1.
- Low Pressure Side Connection On Refrigerant Circuit
- Different versions depending on vehicle. Refer to ADAPTER FOR ASSEMBLING FLUSHING CIRCUIT .
- On refrigerant line from A/C compressor to reservoir.
- Connection To Reservoir
- Different versions depending on vehicle. Refer to ADAPTER FOR ASSEMBLING FLUSHING CIRCUIT .
- On refrigerant line from A/C compressor to reservoir.
- Adapter For Bridging The Removed Reservoir
- Different versions depending on vehicle. Refer to ADAPTER FOR ASSEMBLING FLUSHING CIRCUIT .
- From VW/Audi passenger vehicle set adapter chest VAS 6338/1.
- Refrigerant Charge Hose, refer to ADAPTER FOR ASSEMBLING FLUSHING CIRCUIT
- Charge hose VAS 6338/31 (from VW/Audi passenger vehicle set adapter chest VAS 6338/1) for example.
- Adapter For Bridging The Removed Reservoir
- Different versions depending on vehicle. Refer to ADAPTER FOR ASSEMBLING FLUSHING CIRCUIT .
- From VW/Audi passenger vehicle set adapter chest VAS 6338/1.
- Connection To Reservoir
- Different versions depending on vehicle. Refer to ADAPTER FOR ASSEMBLING FLUSHING CIRCUIT .
- Evaporator
- Component Location Of Restrictor
- Restrictor is removed.
- Remove restrictor. Refer to [For engine(s) BLV, CCTA, CBFA] Removal and Installation .
- Bolts In Refrigerant Line
- Bolt together again after removing restrictor. Refer to [For engine(s) BLV, CCTA, CBFA] Removal and Installation .
- Condenser
- High Pressure Side Connection On Refrigerant Circuit
- Different versions depending on vehicle. Refer to ADAPTER FOR ASSEMBLING FLUSHING CIRCUIT .
- Adapter To Connection For High Pressure Side On Refrigerant Circuit
- Different versions depending on vehicle. Refer to ADAPTER FOR ASSEMBLING FLUSHING CIRCUIT .
- From VW/Audi passenger vehicle set adapter chest VAS 6338/1.
- Charge Hose For Refrigerant Circuit Flushing Device
- From connection to high pressure side of A/C compressor on refrigerant circuit (smaller diameter) to input of Refrigerant Circuit Flushing Device VAS 6336/1 or Refrigerant Circuit Flushing Device VAS 6337/1.
- Refrigerant Circuit Flushing Device
- Different versions and different construction, for example Refrigerant circuit flushing device VAS 6336/1 or Refrigerant circuit flushing device VAS 6337/1A.
- With filter, viewing glass, security valve, heater, refrigerant container, etc. (depending on version).
- Depending on the construction of the A/C service station and of refrigerant circuit flushing device, a check-valve may be installed at output of refrigerant circuit flushing device (to guarantee correct direction of refrigerant flow during flushing).
- Refrigerant Hose Of A/C Service Station
- From low pressure side of A/C service station (mostly colored blue) to output of refrigerant circuit flushing device.