64 51 580 Leak-testing evaporator

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Special tools required:

64 5 104
64 5 107

Necessary preliminary tasks:

Remove expansion valve

Screw down special tool 64 5 107 with retaining clip (1).

For tightening torque refer to 64 53 13AZ in 64 53 REFRIGERANT LINES AND EXPANSION VALVE .

Fig 1: Special Tool (64 5 107) And Retaining Clip

Courtesy of BMW OF NORTH AMERICA, INC.

Connect special tool 64 5 104 to special tool 64 5 107.

Fig 2: Special Tools (64 5 104) And (64 5 107)

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 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

Slowly apply test pressure of 15 bar 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