Cooling Output, Checking

Special Tools And Workshop Equipment Required 

• Digital Thermometer:VAS6519 

Test Requirements 

• Ambient temperature greater than 15 °C (59 °F).
• Radiator and condenser are clean (clean if necessary).
• The ribbed belt, which drives the A/C compressor, is OK and tensioned correctly. The belt pulley is actually driving the A/C compressor (vehicles without a high-voltage system).
• All air ducts, covers and seals are OK and properly installed.
• Seal between the engine compartment, hood and plenum chamber is OK and installed correctly. Refer to OVERVIEW - PLENUM CHAMBER COVER .
• The airflow through the dust and pollen filter is not obstructed by debris. Refer to DUST AND POLLEN FILTER, REMOVING AND INSTALLING to check.
• The heater and A/C unit air intake (in fresh air and recirculating air modes) is not obstructed by dirt or retrofitted components.
• Vehicles without glove compartment cooling: the glove compartment cooling connection is sealed on the heater and A/C unit.
• Vehicles with glove compartment cooling: glove compartment cooling connection is installed on the heater and A/C unit according to the specification.
• The vehicle is not exposed to sunlight.
• Engine at operating temperature: coolant temperature is greater than 80 °C (176 °F).
• The DTC memory for the A/C Control Module -J301- /Climatronic Control Module -J255- control head was checked and erased, basic setting performed and the A/C Control Module -J301- /Climatronic Control Module -J255- coding checked. The Vehicle Diagnostic Tester in the Guided Fault Finding  function was used.
• A/C Control Module -J301- /Climatronic Control Module -J255- adaptation checked using the Vehicle Diagnostic Tester in the Guided Fault Finding  function.

Checking 

-- Close the hood.

-- Measure the ambient temperature.

-- Close the doors, windows and sliding sunroof.

-- Open all instrument panel vents.

-- Set the A/C system temperature to the "coldest" setting.

-- Set the air distribution to the center air distribution.

-- Hold the temperature sensor -2- of the :VAS6519  approximately 20 mm in the displayed area -3- of the instrument panel vent -1-.

Courtesy of VOLKSWAGEN GROUP OF AMERICA, INC.

-- Turn on the A/C System by pressing the AC  button.

-- Start the engine.

-- Bring the engine to approximately 2000 RPM and hold it there.

Evaluate 

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The temperature of the air coming out of the "driver side" instrument panel vents must be within the tolerance range (see diagram) after five minutes, depending on the ambient temperature.

A - Temperature of the air coming out of the "driver side" instrument panel vents

B - Ambient Temperature

C - Permissible Tolerance Range