Audi A4: Testing Equipment, Tools and Materials

General Information

  Note

This list outlines the testers, tools and materials required for expert refrigerant circuit repair work.

• For tools and materials available from the distribution center or importer. Refer to → Chapter "Tools and Materials Available from Distribution Center or Importer".
• For commercially available tools and materials. Refer to → Chapter "Commercially Available Tools and Materials".
• For improvised tools. Refer to → Chapter "Improvised Tools".

Tools and Materials Available from Distribution Center or Importer

Commercially Available Tools and Materials

Improvised Tools

Tools and Materials Available from Distribution Center or Importer

Service station/A/C Service Station (this illustration shows ), currently available A/C service stations. Refer to the Parts Catalog (Tools; Special Tools and Equipment: A/C and Heating).

• Work procedures: The operations "testing, extraction (recycling), evacuation and charging" are to be performed in line with the relevant operating instructions.
• The filters and dryers installed are to be replaced at the latest at the end of the period of use specified in the operating instructions and whenever the station has been drained (keep replacement filter to hand. Available from equipment manufacturer. Refer to A/C service station operating instructions.
• Use can also be made of service stations not described here. Refer to the Parts Catalog (Tools; Special Tools and Equipment: A/C and Heating).
• Currently available A/C service stations are equipped with a program for flushing the refrigerant circuit; the flushing equipment required for flushing is also included in delivery of these A/C Service Stations. Refer to the Parts Catalog (Tools; Special Tools and Equipment: A/C and Heating).

  Note

• This A/C service station has the following known units: charging cylinder, pressure gauge set, vacuum pump, shutoff valves and charging hoses.
• One quick-release coupling each (for service connections on high and low-pressure side) is included in the scope of delivery of this service station.
• Current vacuum display (LED) appears after pressing the "Evacuate" button again.

Leak detection unit, currently available leak detection units. Refer to the Parts Catalog (Tools; Special Tools and Equipment: A/C and Heating).

Leak detection system (for example Leak Detection Kit -VAS6201A-, currently available leak detection systems. Refer to the Parts Catalog (Tools; Special Tools and Equipment: A/C and Heating).

Puller for A/C Clutch Set -VAG1719- (for "Zexel" A/C compressor)

A/C Adapter Set -VAG1785-

Adapter for cleaning refrigerant circuit (flush with refrigerant R134a. Refer to → Chapter "Refrigerant Circuit, Cleaning (Flushing), with Refrigerant R134a"; or blow through with compressed air and nitrogen. Refer to → Chapter "Refrigerant Circuit, Flushing with Compressed Air and Nitrogen".)

A - 5/8"-18 UNF thread for conical seal

B - Union nut (for connection with O-ring) with thread

• A/C Adapter Set - M18 x 1.5 -VAG1785/1-
• A/C Adapter Set - M20 x 1.5 -VAG1785/2-
• A/C Adapter Set - M24 x 1.5 -VAG1785/3-
• A/C Adapter Set - M28 x 1.5 -VAG1785/4-

Adapter

A - 5/8"-18 UNF thread for conical seal

B - Threaded connection for O-ring

• A/C Adapter Set - M18 x 1.5 -VAG1785/5-
• A/C Adapter Set - M20 x 1.5 -VAG1785/6-
• A/C Adapter Set - M24 x 1.5 -VAG1785/7-
• A/C Adapter Set - M28 x 1.5 -VAG1785/8-

Valve adapter

A - 5/8"-18 UNF thread for conical seal

B - Internal thread with valve opener

• M10 x 1.25 VAG1785/9 (for connections with valve on high-pressure side)
• M10 x 1.5 VAG1785/10 (for connections with valve on high-pressure side)

  Note

• A Schrader valve is screwed into connection -A-.
• A valve opener must be installed in the charging hose connection.
• Various adapters from adapter set are also part of the Refrigerant Circuits Adapter Set 1 -VAS6338/1-.

A/C Adapter Set -VAG1786-

A - A/C Adapter Set - Adapter 1 -VAG1786/1- (only for connections with small valve insert on low-pressure side)

B - Charging hose with union nut 5/8"-18 UNF (short version)

C - A/C Adapter Set - Adapter 2 -VAG1786/2-.

  Note

• For connections with large valve insert (standard on "Zexel/Valeo" compressors, gradual change to small valve insert from 10/1994), use is to be made of adapter VAG1785/10 (remove valve from adapter VAG1785/10 or install valve opener in charging hose -B-).
• Beginning from production year 2006, the name of the "Zexel" A/C compressor was changed from "Zexel" to "Valeo".

Refrigerant Sockets -T10364-

  Note

For removing and installing service connections and valve units when the refrigerant circuit is empty.

READ NEXT: