A3 Mk2
| Components of auxiliary heater |
| -V6- = Combustion air blower -V6- |
| – | Voltage at combustion air blower -V6- in V (volts) |
| – | Speed is controlled by auxiliary heater control unit -J364- via voltage. |
| -V54- = Metering pump -V54- |
| – | Activation by auxiliary heater control unit -J364- in full-load mode approx. 5.85 Hz (Hertz, stroke per sec.) with petrol version and 5.13 Hz for diesel version |
| -Q8- = Glow plug with flame monitor -Q8- |
| – | Glow plug is activated at a voltage of approx. 10 V. |
| – | Voltage is controlled by auxiliary heater control unit -J364-. |
| – | Auxiliary heater control unit -J364- recognises that a flame has formed if resistance of glow plug with flame monitor -Q8- remains within a specified range after shutting off voltage (flame monitor). |
