Removing and installing thermostat for large coolant circuit - engine codes CUKB, CXUA — AUDI

🧭 Before you start

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

• Opens: coolant
• Special tools named: T10527/1
• Renewed: gasket

Don't miss

• Disregard (arrows).
• Do not reuse coolant.

🔧 Engine codes this applies to

📋 Procedure

1. Remove engine cover panel .
2. Drain coolant .
3. Unplug electrical connector (1) at charge pressure sender G31 / intake air temperature sender 2G299. [Note: Disregard (arrows).]
4. Press release tabs on both sides and disconnect line (2) for activated charcoal filter system.
5. Move line for activated charcoal filter system clear at air pipe.

6. Release fasteners (arrows) with release tool T10527 and T10527/1.
7. Detach air pipe (1).
8. Version with gearbox breather: Release catch (arrow) and push gearbox breather to one side.
9. Unplug electrical connector (3).
10. Release fasteners (2) with a small screwdriver (arrow) and disengage coolant expansion tank (1) from bracket.
11. Remove nuts (2) and detach bracket (1).
12. Remove bolts (arrows) and detach cover (2) from thermostat housing.
13. Turn thermostat anti-clockwise (arrow) using special wrench T10508 and detach. [Note: Renew gasket.]
14. Lubricate gasket lightly with coolant.
15. Bring thermostat into position with special wrench T10508, press down slightly and turn clockwise (arrow) as far as stop. [Note: Do not reuse coolant.]
16. Fill up with coolant .
17. Install engine cover panel .

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