General Information
General Information
NOTE:
- General A/C refrigerant system servicing procedures (e.g., component/system descriptions, extracting refrigerant, recharging, leak detection, troubleshooting etc.), repair and special tool information
- Before carrying out any work on the A/C refrigerant system, refer to all CAUTIONS and WARNINGS in A/C refrigerant system safety measures
- Evacuate refrigerant circuit using refrigerant recycling/recovery unit Kent-Moore ACR4 (or UL approved equivalent)
- Always plug open refrigerant line connections to prevent dirt and moisture contamination.
- Color coding of O-rings for the R134a refrigerant circuits has been discontinued. Both colored and black O-rings are used.
- Threaded connections of refrigerant circuit must be coated with polyethylene glycol (PEG) VW material no. 294440 before installing.
- Under certain conditions, fluid reservoir with dryer cartridge does not require replacement after the refrigerant circuit is opened.
General Information
New Jetta from m.y. 2005 may be equipped with a dual-zone (right / left - front) Climatronic system.
Climatronic is a fully automatic, digital-electronic climate control system. The temperature of the interior air supply, fresh air blower speeds and passenger compartment air distribution are regulated automatically. The system features fully digital electronic circuitry and On Board Diagnostic (OBD) capability.
In addition to fully automatic function, air distribution settings and fresh air blower speeds can be selected manually to suit individual needs.
The Climatronic Control Module J255 is the heart of the system. It receives input information from the integrated A/C control head and various electronic components (sensors and switches). This information is processed by the control module in accordance with specified values and provides corresponding output signals that control electrical components (actuators).
The system controls interior air temperature and distribution for the driver and front passenger. The system continually samples and compares the selected interior air temperature with the actual air temperature measured by the system. Blower speeds, air temperature and distribution are then adjusted and regulated accordingly.
The A/C control head integrated with -J255- contains all controls and relevant displays needed to operate the Climatronic system. The systems input temperatures are displayed in LCD displays.
All automatic or manual function selections are input into the A/C control head via buttons located between and below the LCD displays.
When "AUTO" mode is selected, fresh air blower speed and air distribution signals are automatically monitored and adjusted. The fresh air blower speed is high when there is a large difference between the selected temperature and the actual interior temperature, and low when the difference is small or the same.
The interior temperature settings speed are indicated on the A/C control head display at all times. The system can be switched on and off by pressing the "OFF" button.
Manually selected settings remain stored in memory after switching the ignition off and will be recalled on subsequent re-start. Only the function "Air recirculation" is erased after 20 minutes.
NOTE:
- Pressing AUTO button overrides all manual settings.
- Climatronic, manual operation Owners Manual
- In "ECON" operation, A/C compressor output is regulated to almost zero delivery. Heating and A/C operation continues to be controlled electronically.
Before troubleshooting or servicing, technicians must be familiar with the functions and operation specifics of the standard or optional A/C system. Always read the owners manual and review applicable system functions.
NOTE: Additional information:
Owners Manual
Wiring Diagrams and Component Locations