Air conditioning system - function check

AP83.00-T-8352BA

Air conditioning system - function check

10.7.02

Inspection

Danger!

Risk of accident from vehicle starting off by itself when engine running. Risk of injury suffered in the form of bruises or burns to the hands when reaching in while the engine cranks or runs

Secure vehicle to prevent it from moving off by itself.
Wear closed and close-fitting work clothes.
Do not grasp hot or rotating parts.

AS00.00-Z-0005-01A



It is only possible to check the function of the air conditioning for its cooling capacity if the temperature in the passenger compartment is above 15 ° Celsius

1

Press the ("R") button in the control with an object similar to a match in order to start a self-test

 During the self-test only the electric lines connected to the control are checked for short-circuit and open-circuit.

 Call up and process faults found which are stored by fault code(s) in the memory



See Konvekta operating instructions.

2

Start engine

 A minimum coolant temperature of 50 °C must be ensured.

3

Press buttons (5, 13) for "blower stage 1"

 The "Blower stage 1" indicator lamps must light up in the buttons (5, 13)



Check refrigerant compressor

4

Adjust specified temperature in passenger compartment to 14 ° Celsius

 See Konvekta operating instructions.

5

Open rear engine flap

6

Carry out visual inspection of refrigerant compressor

 When the engine is running and the air conditioning is switched on, the hub (18) must rotate.



Check condenser fans



The accident prevention regulations should be observed when working in the roof area

7

Carry out visual inspection of condenser (arrows)

 The condenser fans (arrows) must rotate when the air conditioning is switched on.



Check cooling capacity of the front box

8.1

Press button (15) for " air conditioning front box"

 Only with code HO4.

 The "air conditioning front box" indicator lamp must light up in the button (15)

9.1

Hold the sensor of the temperature measuring instrument in the air flow of the driver's area ventilation and ascertain the temperature of the air flowing out

 Only with code HO4.

 The temperature of the air which flows out after approx. five minute's operation must be significantly below the outside temperature.



*WH58.30-Z-1002-08A

Check front box recirculated air flaps

10

Press button (16) for "driver's area recirculated air"

 The"driver's area recirculated air" indicator lamp must light up in the button (16)

The recirculated air flap must switch over audibly.

Check front box radial fans

11

Press button (14) for "blower stage 2"

 The "blower stage 2" indicator lamp must light up in the button (14).

 The blower capacity in the driver's area must increase significantly.



Check front box heat output

12

Open the heating valve of the front box by pressing the button (11)

 The heating valve is opened or closed in 5 % stages by pressing the buttons (11, 12). The programmed opening angle of the heating valve is shown in % in the display (17).

Hold the sensor of the temperature measuring instrument in the air flow of the driver's area ventilation and ascertain the temperature of the air flowing out

 The temperature of the air flowing out is higher, the higher the % display is in the display (17).



*WH58.30-Z-1002-08A

Check passenger compartment cooling capacity

13

Hold the sensor of the temperature measuring instrument in the air flow at the air nozzles (19) and ascertain the temperature of the air flowing out

 The temperature of the air which flows out after approx. five minute's operation must be significantly below the outside temperature. Otherwise check the leaktightness of the air conditioning.



Inspect the refrigeration circuit for leaks.

AR83.30-T-1209-01C



*WH58.30-Z-1002-08A



Check passenger compartment recirculated air flaps

14

Press the button (10) for "passenger compartment recirculated air" and check the position of the air flaps (20)

 The recirculated air indicator lamp in the button (10) must light up and the air flaps (20) must be open.

15

Press button (10) for "passenger compartment fresh air" and check the position of the air flaps (20)

 The recirculated air indicator lamp in the button (10) must extinguish and the air flaps (20) must be closed.

Check passenger compartment radial fans

16

Press button (6) for "blower stage 2 "

 The " blower stage 2" indicator lamp must light up in the button (6).

 The blower capacity must increase significantly.

17

Close all the open air nozzles (19) above the seats in the passenger compartment

18

Open one air nozzle (19) on the left and right side of the vehicle in the passenger compartment

 Compare the air flowing out on the left and right side of the vehicle with each other.

 If the power of the air flowing out is not the same:



Check function of the radial fans on the weak side.



Check passenger compartment heating valves

19

Open the flap of the right rear luggage compartment

20

Detach cover (22) of heating valves (23)

21

Adjust specified temperature in the passenger compartment to 26 ° Celsius

See Konvekta operating instructions.

22

Check lever on the heating valves (23)

 While adjusting the specified temperature in the passenger compartment, the levers on the heating valves (23) must be turned through a maximum of 90°.

As of an outside temperature of above

24 ° Celsius only the heating valve (23) of the roof heater functions. The heating valve (23) of the convectors (21) is put out of operation by the control module



Check passenger compartment roof heater

23

Hold the sensor of the temperature measuring instrument in the air flow of the passenger compartment ventilation and ascertain the temperature of the air flowing out

 Warm air must come out of the air nozzles (19) on the left and right side of the vehicle after approx. 5 minutes



*WH58.30-Z-1002-08A

Check convectors

24

The convectors (21) on the left and right side of the vehicle must get warm after a certain time

As of an outside temperature of above

24 ° Celsius the heating valve (23) of the convectors (21) in the footwell is put out of operation by the control module, if necessary cool down the outside temperature sensor (24) by suitable means.

25

Switch off engine

Number

Designation

WH58.30-Z-1002-08A

Digital temperature measuring instrument (measuring range -20° to +70°)