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HOMESERVICE MANUALSAUDI2001A6 AVANT QUATTROREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSAIR CONDITIONINGA/C SYSTEM COOLING PERFORMANCE, TESTINGTEST REQUIREMENTSNOTES
2001 Audi A6 Avant Quattro

Test requirements: Notes

2001 Audi A6 Avant QuattroSECTION Notes
  • Radiator and condenser clean (clean if necessary)
  • Ribbed belt OK and correctly tensioned and drive plate actually drives compressor (6 and 8 cylinder gas engine).
  • Compressor drive unit (connection between compressor and engine) is correctly installed (only Audi Allroad with 4.2 L engine, see COMPRESSOR DRIVE UNIT, CHECKING, REPLACING ).
  • Air flow through dust and pollen filter not obstructed by dirt
  • Air conditioner unit properly sealed (when fresh air blower is at maximum speed setting, no additional air is drawn in; air delivery is via vents only)
  • Vehicle not standing in direct sunlight Engine at normal operating temperature All instrument panel vents open.
  • Engine running and A/C control head -E87- set as follows:
    • AUTO mode
    • Compressor switched on (LED in ECON button not lit up)
    • Temperature selection LO (for both driver's and passenger's side)
    • Compressor activated (A/C clutch -N25- switched on)
    • A/C Compressor Regulator Valve -N280- is switched on (on vehicles using -N280-. See MEASURING VALUE BLOCKS (VEHICLES FROM MODEL YEAR 2002) (display group 001 and 002).
    • Coolant Fan -V7- running (speed depends on pressure in refrigerant circuit and engine temperature)
    • Fresh Air Blower -V2- running at maximum speed
    • Fresh air/recirculated air flap moved to "recirculated air" mode (within 1 minute of starting engine)
    • Air should come out of the instrument panel vents
    • Both temperature flaps in "cooling" position
NOTE: Check DTC memory if one test requirement is not attained. See CHECK DTC MEMORY (FUNCTION 02) . And carry out output Diagnostic Test Mode. See OUTPUT DIAGNOSTIC TEST MODE (DTM) .
RENDER: 1.0x

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When to See a Mechanic

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

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.