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Home >> Audi >> 2007 >> A3 Base, Standard >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> General, Technical Data - Refrigerant R134A Servicing (1 Of 2) >> General, Technical Data >> Description And Operation >> A/C Service Station >> A/C System, Operating After Charging

A/C System, Operating After Charging

NOTE:
  • If the mechanically driven A/C compressor has been removed, rotate it about 10 times by hand prior to initial start-up (when or after installing, for example prior to installing the ribbed belt) to prevent damage caused by liquid impact when first switched on (any oil in compressor cylinder is forced out on rotation).
  • If the mechanically driven A/C compressor has been removed, prior to initial start-up, activate it via the "basic setting, compressor cut-in" function for the Guided Fault Finding after filling the A/C compressor. Refer to the Vehicle Diagnostic Tester in the "Guided Fault Finding" Function for A/C System and Battery Controls. This prevents the A/C compressor from becoming damaged, for example, by liquid impact when it is first switched on (any oil in the A/C compression chamber is forced out).
  • The vehicle engine drives the mechanically driven A/C compressor via a belt or shaft. The electric A/C compressor is driven by a electric motor attached directly on the A/C compressor (for example, for vehicles with hybrid drive).

Operating an A/C system with an mechanically driven A/C compressor 

-- Start engine with compressor switched off (version with A/C clutch).

Fig 1: Identifying A/C Service Station
GWWN87-0528Courtesy of AUDI OF AMERICA, LLC

-- Set compressor to minimum output, for example, "Econ" or A/C off mode (version with no A/C clutch with regulating valve).

-- Wait until idle speed has stabilized.

-- Switch on compressor and operate system for at least 2 minutes at idling speed.

-- If necessary, check pressures in refrigerant circuit using A/C service station.

-- Turn engine off.

-- Screw out handwheel on quick-release coupling adapter.

-- Disconnect charging hoses from refrigerant circuit.

-- Install the caps.

Operating an A/C system with an electrical driven A/C compressor 

-- Operate the A/C using "basic setting, compressor cut-in" in Guide Fault Finding using the Vehicle Diagnostic TesterA/C System and Battery Regulation.

-- After the basic setting and If necessary, check pressures in refrigerant circuit using A/C service station.

-- Screw out handwheel on quick-release coupling adapter.

-- Disconnect charging hoses from refrigerant circuit.

-- Install the caps.

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