X Series E70 X5 3.0Si (N52K) OFFRD
64 50 ...
A/C efficiency test (R 134a)
Observe the following conditions prior to the A/C efficiency test:
1.
Provide a MoDiC or DIS. Safeguard electrical system integrity by checking the fault memory (no faults in the fault
memory).
2.
Provide a thermometer with separate gauge.
3.
Perform the test in a suitable work bay with an ambient temperature between 20
°
C and 30
°
C.
Re 1:
Connect MoDiC or DIS to car and display evaporator temperature.
Re 2:
Position a thermometer with a separate gauge approx. 5 cm below the roof liner at the height of the B-pillar. Lay
gauge outwards out of vehicle interior.
Re 3:
Heating up vehicle interior:
-
"A/C button" is not activated during the heating process
-
Close all windows and doors.
-
Set recirculated air mode.
-
In A/C menu (MMI) in Air distribution index tab: select 100 % footwell for driver and front passenger and
100 % defrosting for driver (this applies here to driver and front passenger)
-
Maximum temperature setting (28
°
C)
-
Maximum fan speed (adjust 9 pixels from 9 possible on front A/C control panel)
-
Run engine at approx. 2000 rpm until operating temperature is reached, then idle speed.
A/C efficiency test:
Turn on A/C compressor via "A/C button" at a vehicle interior temperature of 50
°
C.
Vehicles with MAX-AC button ("MAX"):
•
Activation of MAX-AC (= maximum chilling capacity)
Vehicles without MAX-AC button ("MAX"):
•
Set maximum chilling capacity by means of following steps:
-
Temperature setting = 16
°
C
-
Fan setting 9 pixels from 9 possible
-
Stratification maximum cold (4 blue bars)
Evaporator sensor temperature must be
≤
15
°
C after 3-4 minutes at approx. 2000 rpm.
Draw off A/C system if this temperature is not reached. Measure amount of refrigerant drawn off.
If drawn-off quantity does not correspond to specified fill quantity: supplement refrigerant and repeat test.
If fill quantity is correct, continue troubleshooting by pressure measurement.
RA A/C efficiency test (R 134a)
BMW AG - TIS
07.02.2013 04:24
Issue status (12/2007) Valid only until next DVD is issued
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