| The air conditioner refrigerant circuit must also remain closed during all other normal vehicle repair operations. |
| Service work which can be performed on the heater and air conditioner without opening the refrigerant circuit is described in this Workshop Manual → Chapter. |
Note | The connections for the senders/switches described in this Workshop Manual are fitted with a valve which closes automatically when the switches are unscrewed. These switches can therefore be replaced at any VW/Audi workshop without draining the refrigerant circuit. |
| Air conditioner servicing work which involves draining the refrigerant circuit and can therefore not be carried out at every VW/Audi workshop is described in → Chapter and → Air conditioner with refrigerant R134a; Rep. Gr.87 (vehicle is to be taken to specialist air conditioner workshop for drainage of the refrigerant circuit). |
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| With the Audi Cabrio, different settings are stored for closed and open convertible top in the operating and display unit, Climatronic control unit -J255-. On opening and closing the convertible top, the operating and display unit, Climatronic control unit -J255- then automatically alters the setting to the value last set with convertible top closed or open. |
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| As of April 2002, operating and display units, Climatronic control unit -J255- with part number index “H” onwards (with hardware/software version as of “XX15”) have gradually been installed. With these operating and display units, Climatronic control unit -J255-, the passenger compartment temperature regulation is designed to be somewhat cooler. → Parts List |
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| Vehicles as of Model Year 2003 are only to be fitted with operating and display units, Climatronic control unit -J255- with part number index “H” onwards. |
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| Vehicles with 4-cyl. engine and petrol direct injection (FSI) are only to be fitted with operating and display units, Climatronic control unit -J255- with part number index “H” onwards. → Parts List |
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| As of Model Year 2003, operating and display units, Climatronic control unit -J255- with part number index “H” onwards (with hardware/software version as of “XX16”) have gradually been installed. These operating and display units, Climatronic control unit -J255- differ as follows from the model with software version “XX15”: |
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| - Modified passenger compartment temperature regulation for Audi Cabrio and open convertible top (designed to be somewhat cooler) |
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| - Extended temperature adjustment range; 16 °C (instead of 18 °C) is now the lowest temperature which can be set → Parts List |
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| Vehicles up to chassis number “399999” in Model Year 2005 (Saloon and Avant) and “012912” in Model Year 2005 (Cabrio) → Parts catalogue are not to be fitted with operating and display units, Climatronic control unit -J255- with part number as of index “AJ” → Parts catalogue. |
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| Vehicles as of chassis number “400000” in Model Year 2005 (Saloon and Avant) and “012913” in Model Year 2005 (Cabrio) → Parts catalogue are only to be fitted with operating and display units, Climatronic control unit -J255- with part number as of index “AJ”. → Parts List |
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