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Testing Audi A8 D3

Air Conditioning ~158 words

Testing

  1. Start engine. Compressor switched on (AUTO mode selected)

If the compressor is activated

  1. Disconnect harness connector -B- from switch. Compressor will stop (low pressure switch open).
  2. Remove switch -A- and install harness connector -B-. Compressor will not be activated (low pressure switch open).

If the compressor is not activated

  1. Disconnect harness connector -B- from switch -A- and bridge terminals -1- and -2- on harness connector -B-. The compressor will be activated.

Note. If the compressor is activated when the terminals are connected together, either the pressure in the A/C system is too low (A/C system empty), or the switch is malfunctioning. Check the pressure in the refrigerant circuit. See A/C REFRIGERANT SYSTEM (R-134A), CHECKING PRESSURES . If the compressor is not activated and the measuring value block display indicates A/C pressure switch -F129- as the cut-off condition, find and repair the open circuit in the wiring between A/C pressure switch -F129- and A/C control head -E87-.