Removing and installing coolant pipes at Denso heat exchanger — AUDI

🧭 Before you start

Fits: Audi A3 (8V, 2012–2020); platform code 85

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• Risk of leaks at heat exchanger.Crushed O-rings and coolant pipes that are not fitted straight or are not attached fully will lead to leaks. — Fit new screw-type clips (2) at connection of coolant pipe to heat exchanger.
• Check that screw-type clips are seated correctly on connections of heat exchanger and coolant pipes. They must not make contact with air distribution housing or other components.

📋 Procedure

1. Remove heater and air conditioning unit .
2. Detach sealing collar (3) at plenum chamber partition panel.
3. Remove bolt (2).
4. Detach bracket (4) for coolant pipe to the left.
5. Detach foam (1).

6. Unscrew bolt (5) and detach screw-type clip (6).
7. Detach coolant pipes (7, 8) from heat exchanger.
8. Check connection (3) of heat exchanger and connection of coolant pipes (2) for damage or dirt.
9. Clean and smooth sealing surface for O-ring.
10. Coat new O-ring (4) lightly with coolant (or lubricate lightly with silicone grease) and attach to coolant pipe (1).
11. Slide coolant pipes into heat exchanger as far as stop.
12. ⚠ Risk of leaks at heat exchanger.Crushed O-rings and coolant pipes that are not fitted straight or are not attached fully will lead to leaks. — Fit new screw-type clips (2) at connection of coolant pipe to heat exchanger.
13. Tighten bolt (1) to torque.
14. Check that screw-type clips are seated correctly on connections of heat exchanger and coolant pipes. They must not make contact with air distribution housing or other components.
15. Install heater and air conditioning unit .
16. Interrogate event memory and erase any entries displayed ("“Guided Fault Finding”").
17. As a final step, check operation of heater/air conditioner.

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