Checking heating output (and activation of temperature flaps) - vehicles with automatically controlled air conditioner (without high-voltage system) — AUDI

🧭 Before you start

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

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• Check by hand to establish whether air is actually emerging from the activated vents.
• Applies to LHD vehicles only; on RHD vehicles G192 is fitted in the right footwell vent duct.

📋 Procedure

1. Close doors, bonnet, windows, sunroof and rear lid.
2. Open all dash panel vents.
3. Start engine. [Note: Vehicles with start/stop system: Should the engine not start or should it be switched off via the "“start/stop function”", try starting the engine by changing the temperature setting on the operating unit J255 e.g. to "“LO”" and activating the "“A/C”" function.]
4. Engine running (or started after changing setting):
5. With the engine running, operate the air conditioner for several minutes at maximum cooling output.

6. "“Read measured values”" for vent temperature senders G150/G151 and evaporator output temperature sender G263 ("“Guided Fault Finding”").
7. Compare measured values for vent temperature senders G150/G151/G192 to measured value for G263. [Note: Check by hand to establish whether air is actually emerging from the activated vents.]
8. Set the highest possible temperature for the driver side.
9. "“Read measured values”" for vent temperature senders G150/G151/G192. [Note: Applies to LHD vehicles only; on RHD vehicles G192 is fitted in the right footwell vent duct.] [Note: On vehicles without V51/V488 (different designations depending on engine version), set the engine speed to approx. 2000 rpm and repeat the test if necessary. If the temperature of the air increases to over 55 °C when the test is repeated with a higher engine speed, this indicates that not enough coolant is flowing through the heat exchanger for the heater. Cause: Delivery rate of engine coolant pump too low with engine idling or heat exchanger not incorporated into coolant circuit as specified Engine, mechanics19Cooling system/coolant; Connection diagram - coolant hoses.The required heating output is not attained if insufficient heated coolant flows through the heat exchanger for the heater.]
10. Set the highest possible temperature for the passenger side.
11. "“Read measured values”" for vent temperature senders G150/G151/G192.
12. Set the lowest possible temperature for the driver and passenger side.
13. "“Read measured values”" for vent temperature senders G150/G151/G192 and evaporator output temperature sender G263
14. Compare measured values for vent temperature senders G150/G151/G192 to measured value for G263.

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