V6 TFSI
Compressor
Removing
- Switch off the ignition.
- Drain the refrigerant circuit.
- Remove front noise insulation.
- Mark the direction of the operation of the ribbed belt - A -.
- Remove the ribbed belt - A -.
- Disconnect the supply line to the power steering vane pump - B - using hose clamps up to 25 mm (3094).
- Disconnect the pressure line - C - to the power steering vane pump- B -.
• When swiveling the pressure line to the side, be sure not to bend, twist or pull the line to the vane pump.
• The power steering vane pump - B - is not removed from the bracket when removing the A/C compressor.
• The pressure line to the vane pump - C - (see illustration above) is secured to the A/C compressor by the bracket with the bolt - C - (see illustration below).
- Remove the refrigerant lines from A/C compressor. Refer to => [ Refrigerant Lines at Compressor ] Refrigerant Lines at Compressor.
• The refrigerant lines are removed from the top.
- Disconnect the electrical connector - A -.
- Remove the screw - B - (tightening specification 25 Nm).
• The bolt - C - (tightening specification 5 Nm) was already removed and the pressure line to the vane pump was removed.
• This illustration shows the A/C compressor in a vehicle equipped with an after-run coolant pump (V51) (not installed on all versions). Depending on the vehicle equipment level, it may be necessary to drain the coolant after-run coolant pump and remove the after-run coolant pump in order to remove the A/C compressor.
• There is an opening - C - in subframe - A - for removing rear screw - B -.
- Remove the bracket - D -.
- Remove the screw - E - (tightening specification 25 Nm).
- Remove A/C compressor - F - from the bracket, pull it forward and swivel it upward.
Installing
Installation is carried out in the reverse order while noting the following:
• An uncertain quantity of refrigerant oil remains in a removed A/C compressor. Therefore, observe the notes for replacing the A/C compressor. => Refrigerant R134a - Servicing
- Before tightening the A/C compressor, check seating of both alignment bushings - A - in bracket or A/C compressor - B -.
• The alignment sleeves - A - have different styles (different lengths), make sure to use the correct style. Refer to Electronic Parts Catalog (ETKA).
• Ensure bushings - A - are properly seated and contact surfaces are clean. Sockets installed incorrectly and dirty or damaged contact surfaces - C - on the bracket or A/C compressor can lead to alignment irregularities between the A/C compressor and engine. Alignment irregularities over operating time lead to damage to the ribbed belt or A/C compressor.
- Turn the A/C compressor by hand 10 rotations before installing the ribbed belt on the pulley (to prevent damage to the compressor when it is first switched on).
- Install the pressure line to the power steering pump.
- Install the ribbed belt - A -.
- Attach the refrigerant lines to the A/C compressor. Refer to => [ Refrigerant Lines at Compressor ] Refrigerant Lines at Compressor.
• Coat the O-ring seals lightly with refrigerant oil prior to installation. Refer to => [ Refrigerant Circuit O-rings ] Refrigerant Circuit O-rings.
• Rotating will prevent damage to the A/C compressor when starting the engine for the first from refrigerant oil that may be located in the compression chamber.
• After fastening the A/C compressor and installing the refrigerant line, check installation position of refrigerant lines, lines must be engaged in bracket (if installed, depending on engine).
• Check refrigerant lines and their bracket to ensure there is enough distance to the other components. Ensure there is also enough distance between belts, bracket and pulley.
- Evacuate and fill the refrigerant circuit.
- Install the remaining removed components.
- Check the event memory of the front A/C display control head, the Climatronic control module (J255) , and erase any displayed malfunctions using the (Vehicle diagnostic tester) in the "Guided Fault Finding" function.
- 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.