AP83.00-T-8352BAS | Air conditioning system - function check | 4.2.03 |
MODEL NMB613.455 with CODE (HKB) Konvekta air conditioning ACX 641 SAPTCO without roof heater
T83.00-0054-11
1 Rotary switch for passenger compartment blower
2 Rotary switch for driver area blower
3 Recirculated air switch
4 Rotary controller for driver area temperature
5 AC operation switch
6 AC indicator lamp
7 Rotary controller for passenger compartment temperature
T83.00-0055-09
8 Air nozzle
10 Convector
9 Air flap
T83.00-0056-01
12 Heating tube
T83.00-0060-08
13 Heating regulating valve
14 Rotary controller for cooling capacity
16 Air nozzle
15 Rotary switch for sleeping cab blower
T83.00-0038-01
18 Clutch hub
condenser fan (arrows)
T83.00-0039-01
Danger! | Risk of accident as vehicle may start off by itself with the engine running. Risk of injury as working around the engine during start-up or while running may result in contusions and burns | Secure vehicle to prevent it from moving. | |
1 | Start engine | A coolant temperature of at least 50 °C must be guaranteed. | |
2 | Rotate rotary switch for passenger compartment blower (1) and rotary switch for driver area blower (2) to stage 1 | ||
3 | Press AC operation switch (5) | The AC indicator lamp AC (6) must light up. The function of the cooling capacity can only be checked if the temperature in the passenger compartment is above 17 °C. | |
| Check refrigerant compressor | ||
4 | Rotate rotary controller for driver area temperature (4) and rotary controller for passenger compartment temperature (7) to maximum cooling capacity | ||
5 | Open rear lid | ||
6 | Carry out visual inspection of refrigerant compressor | The clutch hub (18) rotates when the engine is running and air conditioning is switched on. | |
7 | Close tailgate | ||
| Check condenser fans | ||
Danger! | Risk of death due to falling off the vehicle roof Risk of injury to other persons due to objects falling down when working in the area of the roof | ||
8 | Carry out visual inspection of condenser (arrows) | The condenser fans (arrows) must operate when the air conditioning is switched on. | |
| Check cooling capacity of the front box | ||
9 | 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 which flows out after approx. 5 minutes must be significantly below the outside temperature. | |
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| Check front box recirculated air flaps | ||
10 | Operate the recirculated air switch (3) for recirculated air mode | The recirculated air flap must switch over audibly. | |
| Check front box radial fans | ||
11 | Rotate the rotary switch for the driver area blower (2) from stage 1 to stage 2 and then to stage 3 | The blower capacity of the radial fan must noticeably increase significantly | |
| Check front box heat output | ||
12 | Rotate the rotary controller for driver area temperature (4) to maximum heat output | ||
13 | Check the temperature of the air emerging in the driver area | The temperature of the air which flows out after approx. 3 minutes must be significantly above the outside temperature. | |
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| Check passenger compartment air conditioning cooling capacity | ||
14 | Hold the sensor of the temperature measuring instrument in the air flow at the air nozzles (8) and ascertain the temperature of the air flowing out | The temperature of the air which flows out after approx. 5 minutes must be significantly below the outside temperature. Otherwise check the leaktightness of the air conditioning. | |
| Checking air conditioning system for leakage | ||
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| Check passenger compartment recirculated air flaps | ||
15 | Remove recirculating air filter for passenger compartment ventilation | ||
16 | Press recirculated air switch (3) for recirculated air mode and check the position of the air flaps (9) | The air flaps (9) must be closed. | |
17 | Check recirculated air switch (3) for recirculated air mode and check the position of the air flaps (9) | The air flaps (9) must be open. | |
| Check passenger compartment radial fans | ||
18 | Rotate the rotary switch for the passenger compartment blower (1) from stage 1 to stage 2 and then to stage 3 | The blower capacity of the radial fans must noticeably increase significantly. | |
19 | Close all the open air nozzles (8) above the seats in the passenger compartment | ||
20 | Open one air nozzle (8) on the left and right side of the vehicle in the passenger compartment | ||
21 | Compare the air flow on the left and right side of the vehicle | If the power of the air flow emerging is not the same: | |
Check the function of the radial fan on the weak side and replace if necessary: | |||
| Remove/install radial fan | ||
| Check radial fan for sleeping cab | ||
22 | Open the outer flap on the right of the sleeping cab | ||
23 | Rotate the rotary switch for the sleeping cab blower (15) in stages from stage 0 to stage 3 | The blower capacity of the radial fan must noticeably increase significantly | |
| Check sleeping cab air conditioning cooling capacity | ||
24 | Rotate the rotary controller of cooling capacity (14) to maximum cooling capacity | ||
25 | Hold the sensor of the temperature measuring instrument in the air flow at the air nozzles (16) and ascertain the temperature of the air flowing out | The temperature of the air which flows out after approx. 5 minutes must be significantly below the outside temperature. | |
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| Check sleeping cab air conditioning heat output | ||
26 | Rotate the rotary controller for cooling capacity (14) to minimum cooling capacity | ||
27 | Rotate regulating valve for heater (13) to maximum heat output | ||
28 | Check the temperature of the air emerging at the air nozzles (16) | The temperature of the air which flows out after approx. 3 minutes must be significantly above the outside temperature. | |
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| Check passenger compartment air conditioning heater valve | ||
29 | Rotate rotary controller for passenger compartment temperature (7) to maximum heat output | ||
30 | Open right rear luggage compartment hatch | ||
31 | Check temperature at the heating pipes (12) | The heating pipes (12) must heat up noticeably. | |
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32 | Close right rear luggage compartment hatch | ||
| Check passenger compartment air conditioning convectors | ||
33 | Check temperature at the convectors (10) | The convectors (10) on the left and right side of the vehicle must be warm after approx. 3 minutes. | |
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34 | Switch off engine | ||
35 | Install recirculating air filter for passenger compartment ventilation |
Commercially available tools
Referenced documents
- ap8310t8383bas Replace recirculated air filter
- ar8320t3750ba Remove/install radial fan
- ar8320t3750baf Remove/install radial blower
- ar8320t3750bat Remove/install radial fan
- ar8330t120901c Inspect the refrigeration circuit for leaks.
- as0000z000501a Risk of accident from vehicle starting off by itself when engine running. Risk of injury (bruises and burns) resulting from working on the engine while it is being started or when it is running.
- as6500z000201a Risk of death caused by falling from vehicle roof. Risk of injury to other persons caused by falling objects during work in roof area.