LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Audi >> 2021 >> A4 Quattro Premium Plus, 2.0L Eng VIN B >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> General Servicing >> Air Conditioning >> 87 Air Conditioning >> A/C Compressor >> Overview - Belt Pulley >> OVERVIEW - A/C COMPRESSOR BELT PULLEY WITH A/C CLUTCH -N25-, "Denso"

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
GWWA87-11101Courtesy of AUDI OF AMERICA, LLC
  1. Closure Cap
    • Not always present
  2. Clutch Plate
    • Tightening specification: 30 Nm
    • Replace
    • Removing and installing. Refer to CLUTCH PLATE, REMOVING AND INSTALLING, A/C COMPRESSOR "Denso" (WITH A/C Clutch -N25-) .
    • 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.
  3. Washer
  4. Spacer
  5. 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 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 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.
    • Refer to BELT PULLEY, REMOVING, WITH A/C Clutch -N25-  if it is not possible to remove the belt pulley from the flange on the A/C compressor by hand.
  7. 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 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 :VAS1978B  . 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 thread and then coat the thread lightly with grease.