Removing and installing coolant union: Audi 2.5 TDI (AXD, AXE, BLJ, BNZ, …)

🧭 Before you start

Fits: VW Transporter T5 (7H), VW Transporter T5 (7J)

• Opens: coolant

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• Risk of scalding.The cooling system is pressurised. When the engine is warm, the coolant temperature may be above 100°C.Before opening, cover cap with cloth and open carefully. — Drain coolant .
• Wet new O-ring with coolant, do not use any other lubricants.Press pipe union with O-ring in, taking care not to jam.

🔧 Engine codes this applies to

📋 Procedure

1. Open filler cap on coolant expansion tank.
2. ⚠ Risk of scalding.The cooling system is pressurised. When the engine is warm, the coolant temperature may be above 100°C.Before opening, cover cap with cloth and open carefully. — Drain coolant .
3. Bring lock carrier into service position General body repairs, exterior50Body - front; Lock carrier - service position.
4. Pull coolant hose off connection.
5. Unscrew securing bolts (4) for pipe union (3) and remove pipe union (3).

6. Remove gasket (2) and O-ring (1).
7. Clean seat surfaces for O-ring and flange on union.
8. Clean sealing surfaces on cylinder head with commercially available brake cleaner and lint-free cleaning cloth (e.g. universal clothVAS 6385). [Note: Wet new O-ring with coolant, do not use any other lubricants.Press pipe union with O-ring in, taking care not to jam.]
9. Install union.
10. Screw in securing bolts finger-tight and then tighten to specified torque.
11. Secure coolant hose to union.
12. Replenish coolant .
13. Secure lock carrier General body repairs, exterior50Body - front; Lock carrier - service position.

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