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HOMESERVICE MANUALSAUDI1996A4 BASE, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 81 (AIR CONDITIONING)REFRIGERANT CIRCUIT, SERVICINGCOMPRESSOR, WITH A/C COMPRESSOR REGULATOR VALVE -N280
1996 Audi A4 Base, Standard

Compressor, with A/C compressor regulator valve -N280

1996 Audi A4 Base, StandardSECTION Compressor, with A/C compressor regulator valve -N280
WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2005 Audi allroad, 2004 Audi allroad, 2004 Audi A6, 2003 Audi allroad, and 2003 Audi S6. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
  • Starting September 1998, there was a running change in production from the version 1 air conditioner to the version 2 air conditioner. See AIR CONDITIONING CHANGES .
  • Always observe safety measures. See A/C SYSTEM, SAFETY PRECAUTIONS .
  • A/C system components identified with an asterisk (*) may only be serviced or replaced after properly discharging refrigerant system.
  • A/C system components not identified with an asterisk (*) can be serviced or replaced without discharging refrigerant system.
  • Compressors supplied as replacement parts already contain the full quantity of refrigerant oil required for the A/C system (250 cm3 ).
    Fig 1: Refrigerant Circuit Diagram - Compressor, With A/C Compressor Regulator Valve - N280
    G02722705Courtesy of AUDI OF AMERICA, INC.

    HP = High pressure side 

    LP = Low pressure side 

  • A/C system cooling performance test. See A/C SYSTEM COOLING PERFORMANCE, TESTING .
  • Do not add refrigerant to the A/C system. Always discharge, evacuate and recharge system. See A/C REFRIGERANT SYSTEM (R-134A), DISCHARGING .
  • The tightening torques and O-ring diameters given also apply to the threaded connections for the refrigerant lines between components.
  • Install only O-rings that are approved for use with refrigerant R134a (currently color-coded red, light purple and dark purple).
  • Checking pressures in the A/C system. See A/C REFRIGERANT SYSTEM, CHECKING PRESSURES .
  1. A/C Compressor Regulator Valve -N280- 
  2. Compressor * 
  3. Compressor belt pulley/drive unit 
    NOTE:
    • A rubber element is installed between the belt pulley and drive shaft of compressor, this protects the belt in the event that the compressor is seized or does not move freely.
    • The rubber element disables the power transfer to the compressor, if the compressor produces friction.
    • Vibrations which may occur during compressor operation can be eliminated via the rubber element (dampening function during torque fluctuations).
  4. Oil drain plug * 
  5. High pressure relief valve * 
  6. Circuit with valve * 
  7. High Pressure Sensor of A/C system -G65- 1) 
  8. Condenser * 
  9. Closing cap 
    • with seal
    • Always install
  10. Service connection * 
    • High pressure side to measure, discharge and charge refrigerant circuit
  11. Connectors in refrigerant line * 
  12. Restrictor * 
    • Installed in connector position 11.
  13. Evaporator * 
  14. Service connection * 
    • Low pressure side
    • To measure and discharge refrigerant circuit
  15. Closing cap 
    • With seal
    • Always install
  16. Catch reservoir (Accumulator) * 
RENDER: 1.0x

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