64 51... Leak-testing evaporator

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Special tools required:

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

Necessary preliminary work:

Remove expansion valve . See 64 51 520 REMOVING AND INSTALLING/REPLACING EXPANSION VALVE (N47) or 64 51 520 REMOVING AND INSTALLING/REPLACING EXPANSION VALVE (N20, N26)

NOTE: Graphic similar.

Replace sealing rings.

Use special tool 00 9 030 to mount sealing rings without damaging them.

Fig 1: Identifying Retaining Clip

Courtesy of BMW OF NORTH AMERICA, INC.

Use vehicle screws (1) to screw the special tool 2 286 737 to the retaining clip of the removed expansion valve.

Tightening torque 64 53 9AZ .

Screw special tool 64 5 121 together with special tool 2 286 737 .

Fig 2: Identifying Special Tool (2 286 737) And Special Tool (64 5 121)

Courtesy of BMW OF NORTH AMERICA, INC.

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 nitrogen pressure bottle with pressure reducer to pressure gauge and then connect to special tool 64 5 121 (connecting hose).

NOTE:

Testing device 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 device and of connection to refrigerant line.

The test pressure is set to 10 bar and must not drop by more than 1.5 bar to 8.5 bar over a test period of 2 hours.

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

WARNING: After leakage check, unscrew special tool 64 5 121slowly from special tool 2 286 737 to reduce 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 AIR CONDITIONING