Adapter For Assembling Flushing Circuit

• Various adapters which are required to connect the A/C service station to the refrigerant circuit for flushing and to bridge the removed receiver/dryer or reservoir and expansion valve (specific to vehicle) are in the following table.
• Using a charge hose with 5/8 -18 UNF connections (short version, for example Refrigerant Circuits Adapter Set 1 - Adapter 31 :VAS6338/31  ), connect the two adapters (contained in Refrigerant Circuits Adapter Set 1 :VAS6338/1  ) which have been installed for the removed reservoir or receiver/dryer.
• If a flushed refrigerant circuit is not reassembled immediately after flushing, leave the adapters on the connections and seal the connections on the adapters using Refrigerant Circuits Adapter Set 1 - Adapter 30 :VAS6338/30  (from Refrigerant Circuits Adapter Set 1 :VAS6338/1  ).
• Depending on the A/C compressor version and the date of manufacture, different connection and sealing techniques can be found on the refrigerant circuit. Refer to Refrigerant Circuit .
• Beginning from production year 2006, the name of the "Zexel" A/C compressor was changed from "Zexel" to "Valeo".

Block or screw connections

Fig 1: Identifying Screw & Block Connections

Courtesy of AUDI OF AMERICA, LLC

-- Threaded connection -A-

-- Block connection -B-

Block connections with different types of seals

-- Block connection with radially sealed connection -A- (with plastic or metal guide -B-)

Fig 2: Identifying Different Types Of Block Connections

Courtesy of AUDI OF AMERICA, LLC

-- Block connection with axial sealing connection -C-