Testing The Vehicle Air Conditioning System - Bosch ACS 611 Originalbetriebsanleitung

en | 48 | ACS 611 | Testing the vehicle air conditioning system
8. Testing the vehicle air
conditioning system
8.1 Visual inspection
Prior to service, check all visible components and
connections on the vehicle air conditioning system for
damage.
8.2 Pressure test
!
Follow the additional ACS 611 menu prompting.
1. Call up the start screen.
2. Press <MENU>.
3. Select "PERFORMANCE TESTS" with o u and
confirm with E.
 Message is displayed.
4. Select the number of service hoses.
5. Turn HP and LP valves to "O" position.
 The service hoses are filled.
6. Turn HP and LP valves to "C" position.
7. Connect the service hoses to the vehicle, switch on
the engine and vehicle air conditioning system.
8. Maintain engine speed between 1,500 and 2,000
rpm.
9. Read and record the ambient temperature, HP
pressure, LP pressure and the measured air
temperature from the fan openings.
10. Switch off the engine and vehicle air conditioning
system, remove the service hoses from the vehicle.
11. Turn HP and LP valves to "O" position.
 The service hoses are emptied.
12. After the corresponding message appears on the
display, turn the HP and LP valves to "C" position.
13. Continue with <STOP>.
14. Enter the measured ambient temperature and
confirm with E.
15. Enter the read pressure value (HP) and confirm
with E.
16. Enter the read pressure value (LP) and confirm
with E.
17. Enter the air temperature measured at the fan
openings and confirm with E.
 The entered data is displayed along with the sta-
tus.
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Confirm with E
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Return with <Stop>.
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8.3 Diagnosis
!
The ACS 611 diagnostic software was developed
to provide support and instruction for defects in
vehicle air conditioning systems. The diagnosis and
recommendations serve only as a reference and do
not constitute recommended repair instructions.
8.3.1 Diagnosis preparation
!
Park the vehicle in a place where it is protected
from wind and sunlight. Even slight air movement
can falsify the values.
!
Follow the additional ACS 611 menu prompting.
1. Connect the service hoses to the vehicle.
2. Lower the hood without closing it.
3. Start the engine on the vehicle to be tested.
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The engine should have operating temperature.
4. Increase vehicle speed to 1,500 – 2,000 rpm and
hold.
5. Switch on the air conditioning system.
6. Open the fan openings (middle of vehicle).
7. Set vehicle air conditioning system to maximum
cooling capacity.
8. Set fan to maximum ventilation.
9. Switch off air circulation.
10. Open doors and windows.
!
Check if the compressor switches on.
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Wait (3 – 5 minutes) until the vehicle air
conditioning system cools evenly.
!
Measure the ambient temperature properly. Stay at
a distance of approx. 1 m from the vehicle.
!
Measuring in close vicinity of the engine can lead
to a false diagnosis.
11. Measure and record the ambient temperature.
12. High-pressure gage: Read and record the highest
pressure value when the compressor is switched
on.
13. Low-pressure gage: Read and record the lowest
pressure value when the compressor is switched
on.
14. Temperature: Measure and record the mean air
temperature value (at middle fan openings).
Robert Bosch GmbH