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HOMESERVICE MANUALSAUDI2008A3 BASE, 2.0 E, AUTOMATIC DCTREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSAIR CONDITIONING87 AIR CONDITIONINGGENERAL INFORMATIONA/C SYSTEM, OPERATING AFTER FILLING REFRIGERANT CIRCUIT
2008 Audi A3 Base, 2.0 E, Automatic DCT

A/C System, Operating After Filling Refrigerant Circuit

2008 Audi A3 Base, 2.0 E, Automatic DCTSECTION A/C System, Operating After Filling Refrigerant Circuit
NOTE:
  • Only start engine after refrigerant circuit has been assembled.
  • If possible start engine only with a filled refrigerant circuit.
  • Do not start the engine while evacuating the refrigerant circuit or when the circuit is already evacuated (the A/C compressor could be damaged), refer to General Information .
  • The A/C compressor is always driven by the pulley or by the driveshaft (there is no magnetic clutch). To prevent damage when the A/C compressor is idling, it is lubricated by an internal oil circuit.
  • The compressor has an internal oil circuit to ensure the A/C compressor is not damaged when refrigerant circuit is empty. Prerequisite for the internal lubrication is residual refrigerant oil in A/C compressor.
  • The engine may only be started when the refrigerant circuit is installed correctly. For example; if the refrigerant lines are not connected to A/C compressor, when the engine is running the A/C compressor may heat up (via internal heat generation) so much that the A/C compressor will be damaged.
  • A/C Compressor Regulator Valve -N280- is not activated when the refrigerant circuit is empty and the A/C compressor idles with the engine. As there is no refrigerant in the circuit the oil required to lubricate is not fed to the A/C compressor.
  • All removed parts are re-installed.
  • The refrigerant circuit is filled, refer to CHARGING REFRIGERANT .

If it is necessary to start the engine with a discharged refrigerant circuit: 

  • Refrigerant circuit must be fully assembled.
  • There must be no vacuum in the refrigerant circuit.
  • At least 1/4 of the prescribed refrigerant oil must be in the A/C compressor.
  • Do not rev engine higher than 2500 rpm.
  • The engine should only run as long as is absolutely necessary.

Note the following when starting engine for first time after filling refrigerant circuit: 

-- Start engine with the A/C compressor switched off (Econ operating mode set, indicator light in AC  button does not light up) and wait until engine idle speed has stabilized.

-- Open all instrument panel vents.

-- Set the temperature preset on the A/C Control Head Climatronic Control Module -J255- to cold (for the driver and passenger side).

-- Press the AC  button to switch on the A/C compressor (Auto selected and the indicator light in the AC  button is on) and let the engine and A/C compressor idle for at least 5 minutes.

NOTE:

Note the information regarding operating the A/C system after filling, refer to General Information .

RENDER: 1.0x

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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.