Dismantling and assembling auxiliary/additional heater: Audi A8 D4

🧭 Before you start

Fits: Audi A8 D4 (4H, 2010–2017)

• Renewed: any seals

📋 Procedure

1. Remove auxiliary heater .
2. Detach add-on components of auxiliary heater .
3. Unscrew bolts (8) (4x) and lift cover for water jacket (10).
4. Release clip (9) at bottom, slide it out upwards and detach cover for water jacket (10).
5. Screw out bolts (3) (4x) and carefully detach cover for combustion air blower V6(4) from fuel connection of burner element (20).

6. Unplug 14-pin connector at auxiliary heater control unit (7).
7. Screw out bolts (1) (4x) and detach cover for combustion air blower V6(2).
8. Carefully separate combustion air blower V6(5) from water jacket (17). [Note: When dismantling the auxiliary heater, ensure that the cables of the temperature sensor G18, the temperature sensor 2 for supplementary and auxiliary heating G587, the glow plug for heater Q9, the fuel pre-heating heater element Z66 and the flame monitor G64 are connected in the 14-pin connector. To remove the corresponding components, the electric cables must be released from the 14-pin connector.] [Note: From 06.2011 onwards, modified auxiliary heaters have been in use (changes to auxiliary heater control unit J364, different glow plugs for heater Q9, different burner elements for diesel heaters and modified moulded gasket for petrol heaters). Check the correct version and allocation of these parts prior to installation Electronic parts catalogue. Version (A) of moulded gasket was fitted on petrol heaters until 06.2011. From 06.2011 onwards, version (B) was introduced for noise optimisation. On diesel heaters, version (A) is still installed Electronic parts catalogue.]
9. Clean the various components prior to assembly.
10. Check the various components for damage. Pay particular attention to the sealing surfaces for the components and any permanently attached seals. Renew components with a damaged sealing surface or seal.
11. Renew any seals.

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