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HOMESERVICE MANUALSAUDI1996A4 BASE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)EXTERNAL PAGESDIFFERENT CARSECTION 81 (AIR CONDITIONING)A/C SYSTEM, CHECKING AND TESTINGA/C REFRIGERANT SYSTEM, CHECKING PRESSURESNOTES
1996 Audi A4 Base, Standard

A/C refrigerant system, checking pressures: Notes

1996 Audi A4 Base, StandardSECTION Notes
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.

Safety measures, see A/C SYSTEM, SAFETY PRECAUTIONS .

Before checking refrigerant system pressures, check A/C system cooling performance. See A/C SYSTEM COOLING PERFORMANCE, TESTING .

Use high pressure service valve for checking system pressures.

Test requirements 

  • Condenser and radiator clean and free of obstructions (clean if necessary)
  • Drive belts for compressor and generator in good condition and properly tensioned
  • All air ducts, covers and seals OK and correctly installed
  • Check DTC memory using VAG 1551 scan tool and eliminate/repair any malfunctions indicated (not affecting A/C system)
  • All air distribution flaps reach end positions Engine at normal operating temperature
  • Evaporator housing and heater box do not leak air (draw in secondary air) at high fresh air blower speed
  • Outside (ambient) temperature must be between 15-45° C (59-113° F)
  • Engine running and system set to maximum cooling (AUTO operating mode with LO temperature setting selected):
  • Switch compressor on (warning light in ECON button does not light up)
  • Temperature selection LO (for driver and passenger side) If the compressor is activated (A/C clutch is switched on):
  • Fresh air blower -V2- runs
  • Coolant fan -Ml- runs (at least in 1st speed)
  • Air flow flap closes and fresh air/recirculated air flap opens (within 1 minute after starting vehicle)
NOTE: With fresh air/recirculated air flap open air flows out of outlets in the instrument panel even though the air flow flap is closed.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

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  • • Brakes feel soft, pull hard to one side, or make grinding noises.
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  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.