Removing and installing burner element: Audi A6/A7 C7

🧭 Before you start

Fits: Audi A6/A7 C7 (4G, 2011–2018); platform code 4X

• Renewed: burner element
• Also covered elsewhere: Checking CO2 content in auxiliary heater exhaust gas

Don't miss

• Before installing burner element (B), renew moulded gasket (between burner element and heater) .If the burner element is faulty, also renew the glow plug for heater Q9.
• Renew the burner element if deposits have formed which affect heating operation and cannot be removed with workshop equipment.

📋 Procedure

1. Switch off ignition (and auxiliary heater).
2. Remove auxiliary heater .
3. Detach add-on components of auxiliary heater .
4. Dismantle auxiliary heater .
5. Remove glow plug for heater Q9.

6. Remove fuel pre-heating heater element Z66. [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. You can tell the difference between the two burner elements for diesel heaters by looking at the connection piece for the glow plugs for heater Q9. Version (A) was installed until 06.2011 and version (B) was installed from 06.2011 onwards Electronic parts catalogue.If a version (B) burner element is installed in a diesel heater which previously had a version (A) burner element, the concentration of CO2 in the exhaust gases will increase. Please therefore refer to Checking CO2 content in auxiliary heater exhaust gas.]
7. Pull burner element (B) out of heat exchanger (A). [Note: Before installing burner element (B), renew moulded gasket (between burner element and heater) .If the burner element is faulty, also renew the glow plug for heater Q9.]
8. If applicable, clean inside and outside of burner element (B) with a brass wire brush (spark plug brush).
9. If applicable, clean inside of heat exchanger (A) with a brass wire brush (spark plug brush).
10. Check sealing surfaces at burner element (B) and heat exchanger (A) for damage. [Note: Renew the burner element if deposits have formed which affect heating operation and cannot be removed with workshop equipment.]

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