8 Cylinder
A/C Compressor Refrigerant Lines
Removing
- Turn off the ignition.
- Drain the refrigerant circuit.
• Depending on the allocation of the service connection an on the refrigerant line, and on the version of the vehicle, it may be necessary to remove the additional reinforcement on the left suspension strut dome so that the service coupling of the service station can be connected (for example, on the Audi Q5).
• On the Audi RS 4 and Audi RS 5, it is not necessary to loosen the coolant reservoir to remove the A/C compressor, but rather, the left air filter must be removed. This is different from the other vehicles.
- Remove the coolant hose - 3 - from the coolant reservoir (not Audi RS 4 and Audi RS 5).
- Remove the bolts - arrows - and then move the coolant reservoir to the side with the coolant hoses - 1 - and - 2 - still connected (not Audi RS 4 and Audi RS 5).
- Remove the left air filter (only on the Audi RS 4 and Audi RS 5).
- Remove the front left wheelhouse liner.
- Disconnect the vacuum hose - 1 - and lay the hydraulic oil hose to the side - arrow -.
- Remove the nuts - 2 - and remove the vacuum reservoir.
Risk of damaging refrigerant lines and hoses.
• Do not stretch, kink or bend refrigerant lines and hoses.
- Remove the screw - 2 - and disconnect the refrigerant line from the A/C compressor.
- Remove the screw - 1 - and disconnect the refrigerant line from the A/C compressor.
• Close open lines and connections on A/C compressor using suitable caps (to prevent possible penetration of dirt and moisture).
Installing
Installation is done is reverse order, observe the following:
- Replace the O-rings - D - and - C -. Refer to the Parts Catalog.
• Do not use the O-rings from the sealing caps that are installed on the connections in the replacement compressor when installing the lines.
• Follow the instructions for installing the O-rings. Refer to => [ Refrigerant Circuit O-rings ] Refrigerant Circuit O-Rings.
- Check the guide ring - F - on the connections for both refrigerant lines - B - and - C - for damage.
- Clean the refrigerant line and A/C compressor connections and check for damage.
- Coat the O-ring seals with refrigerant oil prior to installation. Refer to => [ Refrigerant Circuit O-rings ] Refrigerant Circuit O-Rings.
- Insert the respective O-ring - D - and - E - into the groove - G - on the connections for both refrigerant lines - B - and - C -.
- Insert both refrigerant line into each connection on the compressor.
- Tighten bolts - 1 - and - 2 -.
• Tightening specification: 9 Nm (screws with an M6 thread) and 25 Nm (screws with an M8 thread).
• Following attachment of refrigerant pipes to compressor (and installation of compressor) check routing of pipes. They must be inserted in holders provided and not make contact with other components.
- Install the front left wheelhouse liner.
- Evacuate and fill the refrigerant circuit.
- Install the remaining removed components.
- Switch on the ignition.
- Check the Climatronic control module (J255) display and control head DTC memory and erase any displayed malfunctions if necessary. Refer to the Vehicle diagnostic tester in "Guided Fault Finding".
- Operate the A/C system after filling the refrigerant circuit. Refer to => [ A/C System, Operating after Filling Refrigerant Circuit ] A/C System, Operating After Filling Refrigerant Circuit.
• Note the information regarding operating the A/C system after filling.