Adapter For Assembling Flushing Circuit: Notes

• The following table lists the different adapters necessary to connect the A/C Service Station to the refrigerant circuit, to flush and to bypass the removed receiver/dryer or reservoir and expansion valve (depending on the vehicle).
• The adapter from the VW/Audi - Passenger Vehicle Adapter Set have 5/8" -18 UNF threads, so that the filling hose from the R1234y - A/C Service Station can be connected (M12 x 1.5-6G external thread according to SAE J639) an additional adapter from the set may be used (for example the Refrigerant Circuits - Adapter 48:VAS 6338/48  ).
• Connect the two adapters that were installed when reservoir or receiver/dryer was removed (included in VW/Audi - Passenger Vehicle Adapter Set) with a fill hose with connections 5/8 -18 UNF (short version for example Filler Hose).
• If a flushed refrigerant circuit is not reassembled immediately after flushing, adapters remain at connections and seal the connections at the adapters using Refrigerant Circuits Adapter Set 1 - Adapter 30:VAS 6338/30  (from VW/Audi - Passenger Vehicle Adapter Set).
• 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 (vehicle-specific service information).

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-