Checking 2nd heat exchanger switch-off valve N317: VW Sharan II / SEAT Alhambra
Step-by-step checking 2nd heat exchanger switch-off valve N317 for the VW Sharan II / SEAT Alhambra: 10 steps.
Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: VW Sharan II / SEAT Alhambra (7N, 2010–)
Don't miss
- A second mechanic is needed to listen for the opening of the 2nd heat exchanger switch-off valve N317.
📋 Procedure
- Using , select the data bus diagnostic interface J533 via Guided fault finding.
- Select the function "“Switch transport mode on/off”" and set vehicle to transport mode.
- Switch off ignition (terminal 15).
- The Climatronic control unit J255 switches off immediately and the 2nd heat exchanger switch-off valve N317 opens. [Note: A second mechanic is needed to listen for the opening of the 2nd heat exchanger switch-off valve N317.]
- Switch on ignition (terminal 15).
- The Climatronic control unit J255 switches on and the 2nd heat exchanger switch-off valve N317 closes.
- Check actuation of 2nd heat exchanger switch-off valve N317 using hand multimeterV.A.G 1526 E according to ; if necessary, repair the wiring connection using wiring harness repair setVAS 1978 B.
- If noticeable noises such as clicking or chattering can be heard from 2nd heat exchanger switch-off valve N317 during operation, or there is no sound at all (if valve is stuck in closed position), then 2nd heat exchanger switch-off valve N317 must be renewed.
- After renewing valve, repeat test.
- Deactivate transport mode.
Other VW procedures
- Removing engine · 41 torque figures
- Removing and installing camshaft – VW Golf Cabriolet · 47 torque figures
- 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
- Removing and installing fresh air/recirculated air, air flow flap control motor V425 (LHD) · 1 torque figures
- Removing and installing inner triple roller joint
- Removing and installing brake pads and brake caliper C54, C54
- Removing and installing release element · 1 torque figures
- Removing and installing alternator, vehicles with 2.0 l diesel engine
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.