CLIMATRONIC Control Module A/C Control Head Basic Version

The Climatronic Control Module -J255- A/C control head Basic version -A- is available in the following variants (with or without buttons for heated seats, for vehicles with left or right-hand steering, with a temperature scale in degrees Celsius or degrees Fahrenheit).

Fig 1: Identifying A/C System Components
Courtesy of AUDI OF AMERICA, LLC
On the Climatronic Control Module -J255- A/C control head Comfort version -A-, both control knobs cannot be pulled off and replaced individually.
If the temperature and sunshine infrared sensor -B- produces a faulty measurement (installed only in the Climatronic Control Module -J255- A/C control head Basic version -A-), check the Climatronic Control Module -J255- A/C control head. The temperature and sunshine infrared sensor -B- has to be clean.
With the Climatronic Control Module -J255- A/C control head Basic version, air distribution is controlled automatically via a characteristic curve when rotary switch -C- is in position A. Fresh air blower speed is automatically regulated when rotary switch -D- is in position A.