OVERVIEW - A/C COMPRESSOR BELT PULLEY WITH A/C CLUTCH -N25-, "Sanden"

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

-- Remove the belt pulley with the A/C Clutch -N25-. Refer to BELT PULLEY, REMOVING AND INSTALLING .

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

Courtesy of AUDI OF AMERICA, LLC

1. Nut
   • 25 Nm
   • Insert the nut with locking compound. Locking fluid. Refer to the Parts Information.
   • The threads on the nut, that was screwed in with the locking fluid, must be cleaned. Otherwise, there is a risk that the input shaft will break off during assembly.
2. Clutch Plate
   • Replace
   • Removing and Installing. Refer to CLUTCH PLATE, REMOVING AND INSTALLING, A/C COMPRESSOR "Sanden" (WITH A/C Clutch -N25-) .
   • Placed on 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. Spacer
   • For adjusting the gap dimension between the clutch and belt pulley.
   • Check the gap dimension. Refer to GAP DIMENSION BETWEEN BELT AND CLUTCH PLATE, CHECKING, "Sanden" A/C COMPRESSOR (WITH A/C Clutch -N25-) .
4. 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).

5. 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.
6. Circlip
   • Replace
   • 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).

7. Solenoid Coil
   • Make sure the bracket for the cable -B- is installed correctly.
   • The connector may be attached to the A/C compressor with a bracket, depending on the version.
   • For an A/C compressor on which the wires to activate the A/C Clutch -N25- and the A/C Compressor Regulator Valve -N280- are combined in a 3-pin connector. Disconnect the connector from the A/C Compressor Regulator Valve -N280- or remove the wires to the A/C Clutch -N25- with a suitable release tool from the Wiring Harness Repair Set :VAS1978B  from the connector -Item  12-. Refer to CONNECTOR HOUSINGS, RELEASING AND DISASSEMBLING .
8. Screw
   • 3 Nm
   • For securing the bracket -Item  9-, for the connector -Item  12- and the A/C Clutch -N25- ground connection.
   • Before installing check the contact surface on the A/C compressor and the bracket and if necessary clean.
9. Bracket
10. Screw
    • 3 Nm
11. Bracket
12. Connector
    • Different versions depending on the A/C compressor and the A/C Compressor Regulator Valve -N280- (1, 2 or 3-pin)
13. A/C Compressor
    • There are different versions depending on engine installed 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.