Checking heating output (and activation of temperature flaps) - vehicles with automatically controlled air conditioner (with 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. ⚠ When working on a vehicle with the ignition switched on or while the drive system is active, the engine can start unexpectedly and exhaust fumes can cause a health hazard in closed rooms. Moving parts can trap or draw in parts of the body and/or clothing (safety hazard). Before switching on the ignition, perform the following steps:Move selector lever to position PActivate parking brake Switch off ignitionOpen bonnetConnect battery charger (e.g. VAS 5095A) to jump-start connections of 12 V electrical system Switch on ignition — To minimise the number of automatic engine starts when the vehicle's drive system is active during test and measurement work, charge the vehicle batteries e.g. with the battery charger 60AVAS 5904 in battery standby mode Electrical system; General information27Battery; Charging battery and 4-cylinder direct injection engine (1.2, 1.4 ltr. 4-valve TFSI EA 211)00Safety precautions; Safety precautions when working on high-voltage vehicles.
2. For test and measurement work that requires the vehicle's drive system to be active (READY) or the ignition to be switched on, move the selector lever to position "“P”", activate the parking brake and take care to keep well clear of the engine when it is running. Set up any tools needed so that they cannot come into contact with moving parts. [Note: Also move the selector lever to position "“P”" and activate the parking brake before performing test and measurement work for which the ignition must be switched on but where the vehicle's drive system does not need to be active (READY).The status of the drive system (READY) is shown by the control unit in dash panel insert J285 via the "“power meter”"Owner's Manual.Activating and deactivating drive system Owner's Manual (note display of control unit in dash panel insert J285).] [Note: On vehicles with high-voltage system, the engine does not necessarily run when the vehicle's drive system is active. If the engine is too cold and the charge level of the hybrid battery unitAX1 is such that the engine does not started, try starting and running the engine by changing the setting for the function "“e-tron mode”" in the "“Car”"/"“Car systems”" menu of the Multi Media Interface (MMI) e.g. to "“Increase battery charge”", or by releasing the bonnet (with vehicle's drive system ready - see display in "“power meter”" in dash panel insert) Owner's Manual and Infotainment/MMI Operating Manual.The engine is not always started if the hybrid battery unitAX1 is sufficiently charged. If the coolant in the engine is colder than approx. 70 ℃, the coolant flowing through the heat exchanger is first heated by the high-voltage heater (PTC)Z115 and then delivered by the coolant pump for high-temperature circuit V467. In order for the coolant to flow through the heat exchanger correctly, it is important that not only V467, the coolant changeover valve 2N633 and the coolant valve for gearbox N488 are activated correctly, but that the non-return valves are correctly installed in the coolant circuit and function correctly and 19Cooling system/coolant; Connection diagram - coolant hoses. If the temperature of the coolant in the engine exceeds 75 ℃, Z115 is no longer activated. The coolant pump for high-temperature circuit V467 is activated when the engine is stopped so that the coolant flows through the heat exchanger. In order for the coolant to flow through the heat exchanger correctly, it is important that not only V467, the coolant changeover valve 2N633 and the coolant valve for gearbox N488 are activated correctly, but that the non-return valves are correctly installed in the coolant circuit and function correctly and 19Cooling system/coolant; Connection diagram - coolant hoses.]
3. Close doors, bonnet, windows, sunroof and rear lid.
4. Open all dash panel vents.
5. Switch on ignition.

6. ⚠ When working on a vehicle with the ignition switched on or while the drive system is active, the engine can start unexpectedly and exhaust fumes can cause a health hazard in closed rooms. Moving parts can trap or draw in parts of the body and/or clothing (safety hazard). Before switching on the ignition, perform the following steps:Move selector lever to position PActivate parking brake Switch off ignitionOpen bonnetConnect battery charger (e.g. VAS 5095A) to jump-start connections of 12 V electrical system Switch on ignition — Activate vehicle's drive system (engine does not have to start at this point).
7. Change "“e-tron mode”" setting on Multi Media Interface (MMI) or release bonnet; engine will start and run. [Note: On vehicles with high-voltage system, the engine does not necessarily run when the vehicle's drive system is active. If the engine is too cold and the charge level of the hybrid battery unitAX1 is such that the engine does not start, try starting and running the engine by changing the setting for the function "“e-tron mode”" in the "“Car”"/"“Car systems”" menu of the Multi Media Interface (MMI) e.g. to "“Increase battery charge”", or by releasing the bonnet (with vehicle's drive system ready - see display in "“power meter”" in dash panel insert) Owner's Manual and Infotainment/MMI Operating Manual.With vehicle's drive system ready and temperature set to "“warm”" on air conditioner operating unit (Climatronic control unit J255 - "“HI”" on display), the flow of coolant through the heat exchanger of the air conditioning unit is maintained by the coolant pump for high-temperature circuit V467 when the engine is stopped Incorporation of high-voltage heater (PTC) Z115 into coolant circuit and Engine, mechanics19Coolant pump/thermostat assembly; Exploded view - coolant pump.] [Note: Vehicles with high-voltage system: Depending on the setting on the operating unit (Climatronic control unit J255), the coolant temperature, the charge level of the hybrid battery unitAX1 etc., the engine may be running or switched off.]
8. With the vehicle's drive system ready, operate the air conditioner for several minutes at maximum cooling output.
9. "“Read measured values”" for vent temperature senders G150/G151 and evaporator output temperature sender G263 ("“Guided Fault Finding”").
10. 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.]
11. Set the highest possible temperature for the driver side.
12. "“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: So that the coolant heated up by Z115 or the engine is conveyed through the air conditioner heat exchanger, the coolant pump for high-temperature circuit V467, the coolant changeover valve 2N633 and the coolant valve for gearbox N488 must also be activated (by the corresponding engine control unit). To ensure that the coolant flows in the right direction, the non-return valves fitted in the coolant circuit must also be installed correctly, and they must operate correctly. For further information, refer to Incorporation of high-voltage heater (PTC) Z115 into coolant circuit, Engine, mechanics19Cooling system/coolant; Connection diagram - coolant hoses, ("“Guided Fault Finding”") and .The required heating output is not attained if insufficient heated coolant flows through the heat exchanger for the heater.]
13. Set the highest possible temperature for the passenger side.
14. "“Read measured values”" for vent temperature senders G150/G151/G192.
15. Set the lowest possible temperature for the driver and passenger side.
16. "“Read measured values”" for vent temperature senders G150/G151/G192 and evaporator output temperature sender G263
17. Compare measured values for vent temperature senders G150/G151/G192 to measured value for G263.

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