Checking thermostat for map-controlled engine cooling system — AUDI

🧭 Before you start

Fits: Audi A3 (8L, 1996–2003)

Don't miss

• Do not expose the thermostat to air during this test, otherwise the expansion element can become damaged.

🔧 Engine codes this applies to

📐 10 workshop diagrams for AVU

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. Take off engine cover panel (arrows).
2. Unplug connector (2) at map-controlled engine cooling thermostat F265.
3. Connect multimeter to thermostat to measure resistance.
4. Renew map-controlled engine cooling thermostat F265.
5. Remove map-controlled engine cooling thermostat F265.

6. Renew map-controlled engine cooling thermostat F265.
7. Connect the contacts of the map-controlled engine cooling thermostat F265 to a battery using test leads from auxiliary measuring setV.A.G 1594 C.
8. ⚠ Wear protective gloves. — Using pliers, carefully place the thermostat vertically into a pot of boiling water up to the flange. [Note: Do not expose the thermostat to air during this test, otherwise the expansion element can become damaged.]
9. Disconnect voltage supply from battery.
10. Renew map-controlled engine cooling thermostat F265.
11. Interrogate and erase the fault memory for engine control unit, as faults are stored when the connector is unplugged .

Other AUDI procedures

• Erasing learnt values and adapting engine control unit to throttle valve control part and exhaust gas recirculation valve
• Checking secondary air system – VW Passat B5
• Installing poly V-belt · 1 torque figures
• Checking secondary air pump relay J299 and activation
• Checking injection quantity – Audi A8 D3
• Removing and installing toothed belt – Audi · 56 torque figures
• Removing engine – Audi A8 D3 · 41 torque figures
• Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
• Installing engine – Audi A8 D4 · 36 torque figures
• Removing and installing camshaft timing chain · 29 torque figures