A/C Cooling Output, Testing Requirements

Only on vehicles with a mechanically-powered Air Conditioning (A/C) compressor and not on vehicles with a high voltage electrical system (hybrid vehicles).

• The ambient temperature is greater than 15 °C (59 °F).
• Radiator and condenser are clean (if necessary, clean).
• The ribbed belt for A/C compressor drive is OK and correctly tensioned, and the belt pulley actually drives the A/C compressor (on vehicles with a 4- or 6-cylinder engine). Refer to OVERVIEW - BELT PULLEY .
• The A/C compressor drive unit is mounted correctly, and the A/C compressor is actually driven (in vehicles with an 8-cylinder FSI/ TFSI engine). Refer to OVERVIEW - BELT PULLEY .
• All air ducts, covers and seals are OK and properly installed.
• Air flow through dust and pollen filter not obstructed by dirt. Refer to DUST AND POLLEN FILTER, REMOVING AND INSTALLING .
• The air intake of the A/C unit (in fresh air and recirculating air mode) is not impaired by soiling or components installed as retrofit.
• The air duct to the glove compartment cooling is installed according to specification on the "Comfort" A/C system version. Refer to AIR GUIDE FOR GLOVE COMPARTMENT COOLING, REMOVING AND INSTALLING (for A/C systems with the "Basic" version, the connection for the glove compartment cooling is sealed).
• The vehicle is not exposed to sunlight.
• The engine is warm (the coolant temperature is higher than 80 °C (176 °F)).
• The Diagnostic Trouble Code (DTC) memory for the Climatronic Control Module -J255- control head (and for the Rear A/C Display Control Head -E265-) are checked and erased, the basic setting is performed and the coding for the Climatronic Control Module -J255- (and the rear Rear A/C Display Control Head -E265-) are checked. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding"  function.
• The adaptation of the Climatronic Control Module -J255- (and the Rear A/C Display Control Head -E265-, if present) was checked. Refer to Vehicle Diagnostic Tester in the "Guided Fault Finding" Function.
• For vehicles with the "Basic" A/C system version: The following is set in the MMI (Multi Media Interface) via the "A/C" function in the "car" / "car systems" menu for the regulation of the A/C system (if possible): "Air flow center".
• For vehicles with the "Comfort" A/C system version: The following is set in the MMI (Multi Media Interface) via the "A/C" function in the "car" / "car systems" menu for the regulation of the A/C system: automatic recirculation "off", air flow "center" and footwell temperature "medium" (arrow pointing up).

• All instrument panel vents and the vents in the rear center console and in the B-pillar (for the "Comfort" version) are open.
• The vent for glove compartment cooling (in the glove compartment) is closed on the "Comfort" version.
• Ensure that the air outlet from the rear footwell vents (under the front seats) is not blocked by floor mats or other objects.
• The hood is closed.
• The engine is running.

Set the following on the Climatronic Control Module -J255- control head for the "Basic" version: 

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• "Auto" operating mode - indicator lamp in the AUTO  button -1- illuminates.
• Temperature preset "Cold" - both dials -2 and 5- set at stop "cold".
• A/C compressor turned on - The indicator lamp in the AC  -button -6- illuminates.
• Dial -4- for the fresh air blower at "maximum speed".

If equipped, the Rear Temperature Selection Potentiometer -G538- -1- is on "cold".

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Set the following on the Climatronic Control Module -J255- control head for the "Comfort" version: 

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• "Auto" mode - the indicator lamps in both of the AUTO  -buttons -2 and 4- illuminate.
• Temperature preset "cold" via the dials -1 and 5- - "LO" appears for the driver and front passenger side in the display -3- for the Climatronic Control Module -J255- and in the Multi Media Interface display.
• A/C compressor turned on - The indicator lamp in the AC  -button -9- for the Climatronic Control Module -J255- illuminates.
• Preselect for the fresh air blower -7- "maximum speed" - in the Climatronic Control Module -J255- display and the Multi Media Interface display, level "10" or greater.

If equipped, set the Rear Temperature Selection Potentiometer -E265- to the following: 

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• "Auto" mode - the indicator lamps in both of the AUTO  -buttons -3 and 6- illuminate.
• Temperature preselect "cold" via the dials -2 and 7- - "LO" for the left and right side in the display -1-.
• Preselect for the fresh air blower -5- "maximum speed" - in the display level "5" or higher.

Functions with Engine Running

-- The coolant fan(s) (Coolant Fan -V7- and Coolant Fan 2 -V177-) run (activation and speed depend on refrigerant circuit pressure and engine temperature).

-- The fresh air blower runs at maximum speed.

-- The A/C system goes in recirculating air mode (approximately one minute after starting the engine, the back pressure/fresh air door is closed and the air recirculation door is opened. The fresh air blower extracts the air from passenger compartment below instrument panel/behind the glove compartment).