Notes on pulley with air conditioning system magnetic clutch N25 — AUDI

Notes on pulley with
air conditioning system magnetic clutch
N25
Note
If the pulley overload safeguard has been tripped, check the freedom of movement of the air conditioner compressor before replacing the pulley. Replace the entire air conditioner compressor if it is stiff.
It is not normally necessary to dismantle the air conditioner compressor from the engine to detach the pulley. Depending on the engine version, however, it may be necessary to detach the lock carrier from the vehicle and pull it forwards slightly (to create some space)
General body repairs, exterior
Rep. gr.
50
Lock carrier; Removing and installing lock carrier
.
If, depending on the vehicle and engine, the pulley cannot be detached with the air conditioner compressor in position, detach the air conditioner compressor with the refrigerant lines connected: 4-cyl. engine
Chapter
, 6-cyl. TDI engine
Chapter
On vehicles with a 6-cyl. FSI / TFSI engine the air conditioner compressor has to be removed
Chapter
.
Various pulley designs (with different diameters) may be fitted depending on the type of air conditioner compressor and the engine version
Electronic parts catalogue
.
The pulley and magnetic clutch are supplied as one replacement part with one part number. The pulley and drive plate may be held together by a bolt, which is not required and can therefore be disposed of. This bolt is used at the factory to apply a pre-determined quantity of a specific grease to the thread of the drive plate. This quantity of grease is sufficient for once-only screwing of the drive plate onto the compressor shaft (following unscrewing, drive plates are therefore not to be re-used)
Electronic parts catalogue
.
The following illustration shows an air conditioner compressor with a separate connector for actuation of
N25
(this air conditioner compressor has a separate connector for actuation of the
air conditioner compressor regulating valve
N280
. On a different version of the air conditioner compressor, the wiring for actuating
N25
and
N280
is combined in one 3-pin connector. If necessary, eject the wire to
N25
from the connector using a suitable release tool from the
wiring harness repair set
VAS 1978 B
Electrical system; General information
Rep. gr.
97
Releasing and dismantling connector housings
.