Audi A3 1997 Manual page 193

◆ The heat insulation for the expansion valve is OK and properly fitted.
◆ The engine is at operating temperature.
◆ All dash panel vents are open.
◆ With the engine running and operating and display unit -E87 set at:
- "Auto" mode
- Compressor switched on (compressor symbol "frost symbol" lights up on left display or warning lamp in
"ECON"- key does not light up).
- "LO" temperature selected
- If the compressor is driven (air conditioner magnetic clutch is engaged):
- Actuation of radiator fan -V7:
- in vehicles with pressure switch -F129 (at least at speed 1).
- in vehicles with high pressure sensor -G65 (at speed 1 or is switched on during refrigerant performance
check).
Notes:
◆ Radiator fan control unit -J293 versions and vehicle wiring differ for vehicles with pressure switch -F129 and
high-pressure sensor -G65.
=> Parts List
=> Current Flow Diagrams, Electrical Fault-Finding and Fitting Locations
◆ Control unit -J293, installed in vehicles with high-pressure sensor -G65, is available in 2 designs.
- In design "1" the radiator fan is automatically switched on in conjunction with the compressor (the first
fan speed is activated regardless of the pressure in the refrigerant circuit).
- In design "2" the compressor is switched on without the radiator fan; the first fan speed is only activated
once the pressure in the refrigerant circuit has exceeded 12 bar.
- Fresh air blower -V2 runs at maximum speed.
- The fresh/recirculated air flap switches to "recirculated-air" position (within 1 min. after vehicle start-up).
- Air blows out of the dash panel vents.
- Temperature flap is in the "cooling" position.
Note:
If one of the test requirements is not fulfilled, interrogate fault memory and perform final control diagnosis
(=>Page 18 ).
Preparatory work:
- Interrogate fault memory and locate and rectify any faults displayed (=>Page
- Perform basic setting and check coding (=> Page
- Close bonnet and sliding roof.
- Measure ambient temperature.
- Close doors and windows.
Checking:
- Switch ignition on.
- Set operating and display unit -E87 for "auto" mode and "LO" temperature selection.
- Start engine (compressor is driven).
- Actuate button for recirculated-air flap (symbol for "recirculated air" in the right display illuminates).
- Increase the engine speed to 2000 rpm (start of time measurement).
- Measure air temperature from the "centre" dash panel vents.
Heating, Air Conditioner - Edition 06.2000
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permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
4 ).
7.1 - Checking air conditioner refrigeration capacity
Audi A3 1997 ➤
7 ).
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