Conditions

This test permits checking the function (operation) of all components of an automatic climate control system.

Additional pointed tests for finding the cause of a fault are only required in the event of deviations from the functions or air outlets shown here. Run engine at idle and at operating temperature during entire test.






Open fresh air levers (51, 53 and 54). Open side vents left and right (56) (turn wheel in upward direction). Remove glove box.






Air conditions






Layout of swivel inserts for air outlet-center:
51 Lever for air outlet right (55)
52 Swivel inserts for air outlet-center
53 Lever for air outlet left (55)
54 Lever for center air outlet (52)






Layout of air outlets right (mirror image left):
55 Swivel insert for air outlet right
56 Insert for side vent right -
turn wheel in upward direction = open

Notes:
1. In the event of an electrical test of the monovalve (with voltmeter or test lamp) be sure to avoid a short circuit otherwise the electronic switching unit for temperature control may be damaged.






2. Only "non-heatable" or "cooled" air will flow out of swivel insert for rear passenger compartment vent, independent of selected button.
3. At room temperatures >25 °C the cycling of the heating water valve cannot be readily shown during 2nd and 6th test. For this purpose, the vehicle interor should be cooled down to approx. 22 °C (with doors and windows, as well as sliding roof, closed).






4. Other tests can be made with adaptor for automatic climate control 126 589 03 21 00.
5. The function of the diverter flap can be checked by means of position of connecting rod of vacuum element 41. For this purpose, remove footwell cover on driver's side.






Connecting rod inserted:
Flap opened.






Connecting rod extended:
Flap closed.
41 Vacuum element for diverter flap

6. Illustration of special operation conditions:
Only one button at a time should be pushed on principle. The operating conditions described below are therefore not included in test scope. They are shown only to assist customers if such a condition has been established by chance. No damage will occur, even if the vehicle is driven for an extended period.






a) All buttons "a" - "e" not pushed:
Operating condition similar to "c", but the lowest automatic blower stage will then be raised to 3rd stage.
b) Button "e" pushed in combination with another button:
System always in switched-off condition.
c) Buttons "C" and "d" pushed at the same time:
Operating condition similar to "d", but 3rd blower stage will drop to 2nd stage.
d) Buttons "b" and "c" pushed at the same time:
Operating condition similar to "b", but 3rd blower stage will drop to 2nd stage.
e) Buttons "a" and "b" pushed at the same time:
Operating condition similar to "a", but footwell flaps will be additionally open.
f) Operation of button "a" (DEF) will always predominate in relation to selector dial and blower.
g) Buttons "b" and "d" pushed at the same time:
Function similar to "b", but compressor will be switched off.