Checking map-controlled engine cooling thermostat F265: Audi A4 Cabriolet B6/B7 / A4 B6/B7 (ALT, ALZ, AMB, AVJ, …)

🧭 Before you start

Fits: Audi A4 Cabriolet B6/B7 (8H), Audi A4 B6/B7 (8E)

• Special tools named: V.A.G 1594
• Renewed: thermostat, gaskets

Don't miss

• Block off intake ports in cylinder head with clean cloths.
• Disregard (items 1 ... 4).
• The electric heating element now additionally heats the wax in the thermostat.Do not expose the thermostat to air during this test, otherwise the expansion element can become damaged.
• Renew gaskets and seals.Secure all hose connections with the correct type of hose clips (same as original equipment) Parts catalogue.

🔧 Engine codes this applies to

📋 Procedure

1. Pull off engine cover panel (arrows).
2. Unbolt coolant expansion tank (arrow).
3. Unplug electrical connector for coolant shortage indicator switch F66 at expansion tank (bottom) and move expansion tank to one side (coolant hoses (1 ... 3) remain attached).
4. Unplug electrical connectors at intake manifold pressure sender G71(item 1) and intake manifold flap air flow control valve N156(item 2) from front of intake manifold.
5. Release hose clips at connections (arrows) using CLIC hose clip pliersV.A.G 1723.

6. Remove bolts (2) and (3) and detach throttle valve module J338 from intake manifold.
7. Detach vacuum hose (5) at intake manifold.
8. Unscrew nuts (1) and (4).
9. Detach intake manifold from flanges. [Note: Block off intake ports in cylinder head with clean cloths.]
10. Unplug connector (5) at map-controlled engine cooling thermostat F265. [Note: Disregard (items 1 ... 4).]
11. Connect multimeter to thermostat to measure resistance.
12. Renew thermostat .
13. Remove map-controlled engine cooling thermostat F265.
14. Check the thermostat when cold.
15. Renew thermostat .
16. Connect the contacts of the thermostat with a battery using test leads from V.A.G 1594 C.
17. Using pliers, carefully place the thermostat vertically into a pot of boiling water up to the flange. [Note: The electric heating element now additionally heats the wax in the thermostat.Do not expose the thermostat to air during this test, otherwise the expansion element can become damaged.]
18. Check whether the minimum travel of (a) = 7 mm is attained after 10 minutes.
19. Disconnect voltage supply from battery.
20. Renew thermostat . [Note: Renew gaskets and seals.Secure all hose connections with the correct type of hose clips (same as original equipment) Parts catalogue.]
21. Slip intake manifold onto connecting hoses.
22. Secure hose clips at connections using CLIC hose clip pliersV.A.G 1723.
23. Interrogate and, if necessary, erase the fault memory for the engine control unit, as faults are stored when the connector is unplugged .

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