BMW X5: Leak-Testing Evaporator
Special tools required:
- 64 5 104
- 64 5 108
Necessary preliminary tasks:
- Remove expansion valve.
Replace sealing rings (1) and coat with refrigerant oil.
Fig. 90: Identifying Sealing Rings
Mount special tool 64 5 108 and retainer (1) with screws of expansion valve.
Tightening torque.
Fig. 91: Identifying Special Tool (64 5 108)
Connect special tool 64 5 104 to special tool 64 5 108.
Fig. 92: Identifying Special Tool (64 5 104 And 64 5 108)
IMPORTANT: Risk of damage: Use only nitrogen pressure bottles with pressure reducers for leak-testing.
Pressurize evaporator to 15 bar slowly only. Excessively fast pressurization and pressures in excess of 20 bar may cause damage to the evaporator.
Connect nitrogen pressure bottle with pressure reducer to pressure gauge and then connect to special tool 64 5 104 (connecting hose).
NOTE:
- Testing apparatus must be leakproof.
- Ambient temperature and temperature of vehicle must not change during the test procedure.
- Do not move the vehicle during this period.
Apply test pressure of 15 bar slowly and close nitrogen pressure bottle.
Check leak-tightness of testing apparatus and of connection to refrigerant line.
Set test pressure of 15 bar is only permitted to drop by 2 bar to 13 bar over a test period of 2 hours.
If the pressure loss is greater than 2 bar, this indicates that there is a leak in the evaporator unit.
After installation:
- Replace all sealing rings and moisten with refrigerant oil
- Evacuate and fill A/C system.
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Instructions For Opening And Replacing Parts In Refrigerant Circuit
WARNING:
Avoid contact with refrigerant and refrigerant oil.
Follow safety instructions for handling R 134a refrigerant.
Follow safety instructions for handling refrigerant oil.
CAUTION:
A
Instructions For Compressor Replacement
IMPORTANT: Compressors with plastic belt pulleys:
Avoid impacts/knocks to plastic belt pulley (caused by tools,
contact with
base).
Return faulty compressors in their original packaging only.
I
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Replacing Front Axle Carrier
WARNING: Danger to life!
Mount securing fixture for vehicle on lifting platform to prevent the
vehicle from slipping off or tilting down.
Secure engine in installation position to prevent it from falling down.
Necessary preliminary tasks:
Lower front axle support.
Remove both lower control arms
Exhaust Gas Turbocharging
The turbocharger is driven by the engine's exhaust gases, i.e. exhaust gases
under pressure are routed by the turbocharger turbine and in this way delivers
the motive force to the compressor, which rotates on the same
shaft.
It is here that the induction air is precompressed in such a way that a
