6 Cylinder
A/C Compressor
Removing
- Switch 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).
- Remove front noise insulation.
- Remove the bolts - 1 - and nuts - 3 - and then remove the left longitudinal brace - 2 -.
- Remove the left front wheel and the left front wheel housing liner..
- Mark the direction of the operation of the ribbed belt - A -.
- Remove the ribbed belt - A -.
- If equipped, clamp the supply line (suction hose) to the power steering pump - B - with hose clamps (3094).
- Remove the pressure line - C - from the power steering pump - B -, if necessary.
• 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 and power steering pump are installed only on vehicles without electro-mechanical power steering.
• 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 => [ A/C Compressor Refrigerant Lines ] A/C Compressor Refrigerant Lines.
• The refrigerant lines are removed from the top.
• On vehicles with a gasoline engine and dynamic steering (depending on where the intake hose is installed on the power steering pump), first loosen the A/C compressor from the bracket and then remove the refrigerant pipes from the A/C compressor. Refer to => [ A/C Compressor Refrigerant Lines ] A/C Compressor Refrigerant Lines.
- Disconnect the electrical connector - A -.
- Remove the bolt - B - (and bolt - C -) (tightening specification: 25 Nm).
• The bolt - C - (tightening specification: 25 Nm) was already removed on vehicles with a power steering pump when the pressure line to the power steering pump was loosened.
• The pressure line and power steering pump are installed only on vehicles without electro-mechanical power steering.
• 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 (draining the coolant and removing the After-Run Coolant Pump. ).
• Depending on the version of the compressor and of the vehicle (different fans for the coolant, water cooler and hoses for the after-run coolant pump) it may also be necessary to bring the lock carrier in the service position (so that the A/C compressor can be swiveled downward).
Information for the service position of the lock carrier:
• When the bolts - A - are first removed, and after bolts - A - are removed, mark the position of the lock carrier - B - , for example with a water resistant marker on the longitudinal member - C - (through the left and right hole) so that it can be installed exactly in the same position.
• When both bolts - D - are removed and then longer bolts - E - (for example bolts M10 x 100) are installed, the lock carried can be moved approximately 60 mm (2.4 in.) forward after the bolts - F - are removed.
• Using the sleeves - G - (or a suitable pad approximately 60 mm (2.4 in.) long), secure the lock carrier - C - from sliding back.
- Remove the bracket - D -.
- Remove the bolt - E - (tightening specification 25 Nm).
- Remove the A/C compressor - F - from the bracket, pull it forward and swivel it downward.
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.
- 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 => [ A/C Compressor Refrigerant Lines ] A/C Compressor Refrigerant Lines.
• 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 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.