Repairing Sanden SD6 V12 air conditioning system magnetic coupling N25 — VW
Repairing Sanden SD6 V12 air conditioning system magnetic coupling N25 on VW: factory workshop procedure. Full factory text, tools and checks.
Workshop procedure for VW — the factory write-up, straight from real workshop data.
📋 Procedure
ℹ️ Torque figures below come verbatim from workshop data — always cross-check against your vehicle's factory manual before final tightening.
Repairing Sanden SD6 V12
air conditioning system magnetic coupling
N25
Special tools and workshop equipment required
Torque wrench
V.A.G 1331
Drift
2051
Pin wrench
3212
Not illustrated:
Two-arm puller, e.g. KUKKO 20-10 with 100 mm hooks or three-arm puller, e.g. KUKKO 45-2 with 44-45 hooks
Open jaw flexible spanner
Circlip pliers
Note
The coupling can also be repaired without extracting the refrigerant. In this case, unbolt air conditioner compressor from bracket and secure to body
Chapter
.
If the air conditioner compressor is to be removed, the refrigerant must be extracted beforehand, e.g. with the
air conditioning service station
VAS 6007A
.
To prevent the ingress of moisture, all components of the refrigerant circuit which have been opened must be sealed with suitable plugs.
Removing
Move lock carrier to service position
Rep. Gr.
50
.
Unbolt air conditioner compressor from bracket
Chapter
.
If air conditioning compressor is to be removed, perform the following work:
Extract refrigerant, e.g. with
air conditioning service station
VAS 6007A
.
WARNING
Danger of freezing injuries.
If refrigerant circuit has not been evacuated, refrigerant may escape.
Extract refrigerant before opening refrigerant circuit.
Separate refrigerant hoses from air conditioner compressor.
Circlip
Renew.
Install correctly: flat side faces air conditioner compressor.
Ensure that it is seated correctly in groove.
Air conditioning system magnetic coupling
N25
Remove
Chapter
.
Locking with dowel pin.
Secured with circlip
Item
.
Note
An overheating fuse is installed in the solenoid. The overheating fuse interrupts the solenoid as soon as the magnetic coupling overheats (for example due to a stiff or tight compressor).
Spacers
To adjust clearance between coupling and V-poly V-belt pulley.
Checking clearance
Chapter
.
Dowel pin
Air conditioner compressor
Secure removed air conditioner compressor in a vice
Chapter
.
Poly V-belt pulley
Pulling off
Chapter
.
Fitting
Chapter
.
Circlip
Renew.
Install correctly: flat side faces air conditioner compressor.
Ensure that it is seated correctly in groove.
Coupling disc
Pulling off
Chapter
.
Checking clearance
Chapter
.
Hexagon nut
20 Nm.
Self-locking.
Always renew.
Removing
Chapter
.
TorqFix answers live for your specific car — tell it the engine code and it serves the matching sequence, torque figures and wiring for that exact variant.
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Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.