| Checking cooling output of air conditioner (not for vehicles with a high-voltage system) |
| Vehicles with mechanically driven air conditioner compressor only, not for vehicles with a high-voltage system (hybrid vehicles) |
| Special tools and workshop equipment required |
| t
| Vehicle diagnostic, testing and information system -VAS 5051/- or vehicle diagnostic and service information system -VAS 5052- with the corresponding connecting cable. |
| t
| Commercially available thermometer (for temperature measurement; if applicable use thermometer with 2 probes for simultaneous measurement of temperature e.g. on right and left) |
| t
| Prerequisites for checking cooling output of air conditioner → Chapter |
Note | t
| As of Model Year 2010 a start/stop system will be available as an optional extra for this vehicle in conjunction with certain engines. The stop function may be inhibited by the operating and display unit, Climatronic control unit -J255- depending on its setting. If „Defrost“ mode has been set for example, no stop function is possible or the stop function is terminated and the engine started as soon as this mode is selected. This also applies if the difference between the set specified temperature and the measured actual temperature exceeds a certain value in heating and cooling mode → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051. |
| t
| Depending on the vehicle model, -V50- (-V36-) is actuated not only with the „Stop function“ active but also with the engine running e.g. with „warm“ temperature setting on the air conditioner operating and display unit, Climatronic control unit -J255- („HI“ display on air conditioner operating and display unit and Multi Media Interface). -V50- (-V36-) is then actuated to assist the engine coolant pump → "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051. |
| t
| As of the start of production until conversion from Model Year 2012 onwards, evaporators with a width (block depth) of approx. 40 mm were fitted (air conditioning unit with part number „8K_ 820 005“). As of Model Year 2012 and depending on the vehicle model, evaporators with a width (block depth) of approx. 50 mm are to be gradually introduced (air conditioning unit with part number „8T_ 820 005“). Pay attention to correct assignment of the expansion valve to the evaporator (different versions) → Electronic parts catalogue. |
|
|
|
