OVERVIEW - BELT PULLEY, A/C COMPRESSOR WITH A/C Clutch -N25-

WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 2018 Audi S6, 2018 Audi A6 Quattro, 2018 Audi A6, 2017 Audi S6, and 2017 Audi A6 Quattro. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Exploded View Of Belt Pulley, A/C Compressor With A/C Clutch -N25-

Courtesy of AUDI OF AMERICA, LLC

Sealing Cap
- Not always present
Clutch Plate
- Replace
- Attached to the A/C compressor input shaft
  -- Clean the contact surfaces on the clutch plate and belt pulley before installing.
  
  -- Clean the thread on the A/C compressor shaft before installing the clutch plate.
  
  -- Check the gap dimension between the belt and clutch plates and correct it if necessary before tightening. Refer to CLUTCH PLATE, REMOVING AND INSTALLING .
  
  NOTE:
  The thread of the new clutch plate has already been greased with a specific amount of a grease by the manufacturer.
- There are different versions. Refer to the Parts information.
- The overload protection takes over when the torque is excessive (for example, if the A/C compressor runs with resistance) and the belt pulley runs freely without driving the A/C compressor with the A/C Clutch -N25- switched on.
  Removing and installing
  
  -- Hold the compressor shaft -C- tight and turn the clutch plate counter-clockwise in direction of -arrow- with a suitable tool to remove as described for the drive plate on an A/C compressor without an A/C clutch. Refer to BELT PULLEY, REMOVING AND INSTALLING, A/C COMPRESSOR "Denso " VERSION "1" .
- Tightening specification: 30 Nm
Washer
Spacer
- For adjusting the gap dimension between the clutch and belt pulley
- To check the gap dimension. Refer to GAP DIMENSION BETWEEN BELT AND CLUTCH PLATE, CHECKING .
Circlip
- Replace
- Install on correct side (flat side toward A/C compressor)
- Be careful not to bend the circlip more than necessary when installing it.
  -- Insert circlip on correct side, the side with beveled insertion edge -C- faces away from A/C compressor (install the flat side facing the A/C compressor).
Belt Pulley
- The belt pulley is sensitive to impact. Be very careful when handling it.
- Clean the flange on the A/C compressor flange before installing the belt pulley.
- There are different versions (depending, for example, on the type of engine). Refer to the Parts information.
- If it is not possible to remove the belt pulley from the flange on the A/C compressor by hand, the. Refer to BELT PULLEY, REMOVING .
Circlip
- Replace
- Install on correct side (flat side toward A/C compressor)
- Be careful not to bend the circlip more than necessary when installing it.
  -- Insert circlip on correct side, the side with beveled insertion edge -C- faces away from A/C compressor (install the flat side facing the A/C compressor).
Solenoid Coil
- Make sure the bracket for the cable -B- is installed correctly.
- The connector -D- may be attached to the A/C compressor with a bracket, depending on the version.
- On an A/C compressor where the electrical wires for the activation of the A/C Clutch -N25- and the A/C Compressor Regulator Valve -N280- are combined in a 3-pin connector, remove the wire to the A/C Clutch -N25- from the connector using an appropriate release tool from the Wiring Harness Repair Set:VAS1978B . Refer to CONNECTORS .
Air Conditioning (A/C) Compressor
- Depending on engine version and the market, different versions may be installed. Refer to the Parts information.
- Clean the A/C compressor flange before installing the pulley.
- Clean the compressor shaft thread and then coat the thread lightly with grease.
  NOTE:
  There are different versions depending on the refrigerant (R134a or R1234yf). Refer to the Parts information.