BMW X5: Air Conditioner Test (R 134A)
Before A/C efficiency test, satisfy following conditions:
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 ºC and 30 ºC.
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 heating up.
- Close all windows and doors.
- Set recirculated air mode.
- Select air distribution mode for footwell and defrosting.
- Maximum temperature setting.
- Maximum fan stage.
- Run engine at approx. 2000 RPM until operating temperature is reached,
then idle speed.
A/C efficiency test:
Turn on A/C compressor at a vehicle interior temperature of 50 ºC.
After 3-4 minutes, the evaporator sensor temperature must be > or = 15 ºC.
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.
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WARNING: Although R 134a at normal temperature is non-toxic,
non-flammable and
not explosive in air in any mixture ratio, it is still essential to follow
various safety precautions.
The filled refrig
IMPORTANT: It is absolutely essential to read and comply with the
equipment manufacturer's
instructions for use provided in the equipment case!
Read and comply with the instructions for use provided
WARNING: Refrigerant circuit is under high pressure!
Repair work may only be carried out on a DEPRESSURIZED refrigerant
circuit!
Avoid contact with refrigerant and refrigerant oil.
Follow safety inst
SEE MORE:
Head Gasket
The head gasket design on the N54 is unique to that engine.
It features a multi-layer steel design. There is no silicone rubber perimeter
"shelf" as on the N52. This is not
needed due to the aluminum block on the N54.
The N52KP and N51 engines are still using the head gasket that is f
Special tools required:
11 9 470
11 9 472
11 9 473
11 9 474
11 9 475
11 9 480
11 9 490
(cylinder bank 5 to 8)
Removal of intermediate levers is described separately from installation.
Necessary preliminary tasks:
Remove servomotor for left eccentric shaft.
Remove ignition coils on cylin