Audi A3 1997 Manual page 142

Audi A3 1997 ➤
Heating, Air Conditioner - Edition 06.2000
Notes:
- -> Jumper contacts 1 and 2 of connector -B- in order to check refrigeration capacity with switch removed.
- The refrigerant circuit remains closed - connection with valve.
Check function.
- Start engine
- Compressor switched on (set "auto" mode on the operating and display unit).
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- Compressor is driven:
- -> Detach connector -B- from switch.
- Compressor stops (low pressure switch open).
- Remove switch -A- and connect connector -B-.
- Compressor is not switched on (low pressure switch open).
- Compressor is not driven:
- Detach connector -B- from switch -A- and jumper contacts 1 and 2 at connector -B- => compressor is
switched on.
Notes:
◆ If the compressor is switched on when jumpered, either the refrigerant circuit pressure is too low (refrigerant
circuit empty) or the switch is defective.
◆ To check the pressure in the refrigerant circuit, send the vehicle to an VW and Audi air-conditioning service
centre.
◆ If the compressor is not switched on and the switch -F129 is displayed as a compressor shutoff criterion in
the measured value block, locate and rectify the open circuit in the wiring between the switch -F129 and the
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87 - Air conditioning