64 51... Leak-testing evaporator

WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 BMW 328xi, 2012 BMW 328i, 2011 BMW 328xi, 2011 BMW 328i, and 2010 BMW 328xi. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: It is essential, when handling nitrogen, to observe the standard national safety regulations.
Ensure that employees are advised of how to handle pressurized vessels and nitrogen correctly (danger of asphyxiation). For this purpose, follow the notes and instructions in the technical safety specifications available from the gas supplier.

Necessary preliminary tasks:

Remove EXPANSION VALVE

Replace sealing rings (1) and coat with refrigerant oil

Fig 1: Identifying Sealing Rings

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Screw special tool 64 5 124 together with retaining clip (1).

Tightening torque 64 53 13AZ .

Fig 2: Identifying Retaining Clip

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Connect special tool 64 5 124 to special tool 64 5 121 .

Fig 3: Identifying Special Tools (64 5 124) And (64 5 121)

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IMPORTANT: Risk of damage: Use only nitrogen pressure bottles with pressure reducers for leak-testing.
Pressurize evaporator to 10 bar slowly only. Excessively fast pressurization and pressures in excess of 20 bar may cause damage to the evaporator.

Connect pressurized nitrogen cylinder with pressure reducing valve to pressure gauge and then connect to special tool 64 5 121 (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 10 bar slowly and close nitrogen pressure bottle.

Check leak-tightness of testing apparatus and of connection to refrigerant line.

Set test pressure of 10 bar is only permitted to drop by 2 bar to 8.5 bar over a test period of 1.5 hours.

If the pressure loss is greater than 1.5 bar, this indicates that there is a leak in the evaporator unit.

WARNING: After leak-testing, unscrew special tool 64 5 121slowly from special tool 64 5 124 to release pressure.

After leak-testing:

Replace sealing rings. Use special tool 00 9 030 to mount sealing rings without damaging them.
Assemble A/C system
EVACUATE AND FILL A/C SYSTEM