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

-- Perform the preparatory work. Refer to PRELIMINARY WORK FOR REPLACING BELT PULLEY .

Fig 1: Belt Pulley With A/C Clutch -N25- Overview

Courtesy of AUDI OF AMERICA, LLC

1. Closure Cap
   • Not always present
2. Clutch Plate
   • Replace after removing
   • Removing and installing. Refer to CLUTCH PLATE, REMOVING AND INSTALLING, "Denso" A/C COMPRESSOR .
   • Attached to the A/C compressor input shaft
   • 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.
   • 30 Nm
3. Washer
4. Spacer
   • For adjusting the gap dimension between the clutch and belt pulley.
   • Check the gap dimension. Refer to GAP DIMENSION, CHECKING BETWEEN BELT PULLEY AND CLUTCH PLATE, "Denso" A/C COMPRESSOR .
5. Circlip
   • Replace after removing
   • Install on correct side (flat side toward A/C compressor)
   • Be careful not to bend the circlip more than necessary when installing it.
   • Insert the circlip on correct side, the side with beveled insertion edge -A- faces away from A/C compressor (install the flat side facing the A/C compressor).
6. Belt Pulley
   • The belt pulley is sensitive to impact, therefore handle it carefully.
   • Clean 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.
   • Refer to BELT PULLEY, REMOVING  if it is not possible to remove the belt pulley from the flange on the A/C compressor by hand.
7. Circlip
   • Replace after removing
   • install on correct side (flat side toward A/C compressor)
   • Be careful not to bend the circlip more than necessary when installing it.

     -- Insert the circlip on correct side, the side with beveled insertion edge -A- faces away from A/C compressor (install the flat side facing the A/C compressor).

8. 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 wires for activating 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:VAS 1978 B  . Refer to CONNECTOR HOUSINGS, RELEASING AND DISASSEMBLING .
9. A/C Compressor
   • There are different versions installed depending on the engine and the vehicle market. Refer to the Parts Information.
   • Clean the A/C compressor flange before installing the belt pulley.
   • Clean the compressor shaft threads and then coat the threads lightly with grease.