Removing and installing high-voltage cable for high-voltage heater (PTC) — VW
Removing and installing high-voltage cable for high-voltage heater (PTC) on VW: 16 steps, engines CUKB, CUKC.
Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: VW Golf VII (5G, 2012–2020)
📋 Procedure
- De-energise high-voltage system .
- Remove noise insulation at rear General body repairs, exterior66Noise insulation; Removing and installing noise insulation.
- Unscrew bolt (4) and nuts (1).
- Lay high-voltage heater (PTC) with coolant hoses connected to one side.
- Disconnect high-voltage cable (3) from high-voltage heater (PTC) (2).
- Pull out connector lock (3)(arrow A) to disconnect connector.
- Push locking mechanism (4) in (direction of arrow B), and pull off connector (1) approx. 5 mm until it is engaged in second locking detent.
- Push locking mechanism (5) in (direction of arrow D), and pull connector off connector mounting (2)(arrow C).
- Lay high-voltage cable (2) to one side.
- Disconnect high-voltage cable (3) on charging unit 1 for high-voltage batteryAX4(item 1).
- Pull out connector lock (3)(arrow A) to disconnect connector.
- Push locking mechanism (4) in (direction of arrow B), and pull off connector (1) approx. 5 mm until it is engaged in second locking detent.
- Push locking mechanism (5) in (direction of arrow D), and pull connector off connector mounting (2)(arrow C).
- Remove high-voltage cable.
- Installation is carried out in the reverse order; note the following:
- Re-energise high-voltage system .
Other VW procedures
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- Adjusting valve timing – VW Passat B5 · 83 torque figures
- Removing and installing camshafts – VW Passat B6 · 39 torque figures
- Removing and installing coolant pump · 53 torque figures
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.