Checking heating output (and activation of temperature flaps) - vehicles with air conditioner — AUDI

🧭 Before you start

Fits: Audi R8 (4S, 2015–)

Don't miss

• The indication in the rotary/pushbutton controls (2, 4, 6) and the buttons (3, 5, 7) is only visible when the ignition is switched on and goes out when the ignition is switched off.

📋 Procedure

1. Close doors, bonnet, windows and rear lid.
2. Open all the dash panel vents and the vents in the doors.
3. Start the engine and make the following settings on the front air conditioner operating and display unit E87(1): [Note: The indication in the rotary/pushbutton controls (2, 4, 6) and the buttons (3, 5, 7) is only visible when the ignition is switched on and goes out when the ignition is switched off.]
4. With the engine running, operate the air conditioner for several minutes at maximum cooling output.
5. "“Read measured values”" for vent temperature senders G385 (or G386) and evaporator output temperature sender G263 in "“Guided Fault Finding”" mode (for E87). [Note: The designations and fitting locations of the temperature sensors are different. On left-hand drive vehicles, G385 is installed in the air duct under the dash panel to the vent in the left door. On right-hand drive vehicles, the front right chest vent temperature sensor G386 is installed in the air duct under the dash panel to the vent in the right door.]

6. Use a thermometer to measure the temperature of the air emerging from the vent in the right door (left on vehicles with right-hand drive).
7. Compare the measured values for vent temperature senders G385 (or G386) and G192 and the temperature measured using a thermometer with the measured value from the G263. [Note: Check by hand to establish whether air is actually emerging from the actuated vents.The temperature flap control motor V68 is moved between the end stops learned in the "“Basic setting”" function as a function of the set temperature in "“Guided Fault Finding”" mode (for E87).]
8. "“Read measured values”" for vent temperature senders G385 (or G386) and G192.
9. Use a thermometer to measure the temperature of the air emerging from the vent in the right door (left on vehicles with right-hand drive). [Note: The designations and fitting locations of the temperature sensors are different. On left-hand drive vehicles, G385 is installed in the air duct under the dash panel to the vent in the left door. On right-hand drive vehicles, the front right chest vent temperature sensor G386 is installed in the air duct under the dash panel to the vent in the right door.The temperature in the passenger compartment is measured via the temperature sensors (8, 9) installed in E87(1).] [Note: On vehicles without V51, 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 heating system heat exchanger not incorporated into coolant circuit as specified and 19Cooling 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 lowest possible temperature.
11. Set the lowest possible temperature on E87(1).
12. "“Read measured values”" for vent temperature senders G385 (or G386) and G192.
13. Use a thermometer to measure the temperature of the air emerging from the vent in the right door (left on vehicles with right-hand drive). [Note: The designations and fitting locations of the temperature sensors are different. On left-hand drive vehicles, G385 is installed in the air duct under the dash panel to the vent in the left door. On right-hand drive vehicles, the front right chest vent temperature sensor G386 is installed in the air duct under the dash panel to the vent in the right door.The temperature in the passenger compartment is measured via the temperature sensors (8, 9) installed in E87(1).]

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