64 53 761 Pressure line from connecting piece to rear heater - A/C system: Notes

Risk of damage!

Restart engine only when A/C system has been correctly filled.

Follow INSTRUCTIONS  for opening and replacing parts in refrigerant circuit.

If A/C system is opened for more than 24 hours:

Replace desiccant insert for air conditioning system. See REPLACING DESICCANT INSERT  or REPLACING DESICCANT INSERT (CAPACITOR REMOVED) .

To ensure that the refrigerant is almost completely drained from the rear air conditioner:

In the diagnosis system under Service functions carry out the instruction for "Draining/filling refrigerant circuit".

Necessary preliminary tasks: 

• DRAWING OFF, EVACUATING AND FILLING THE A/C SYSTEM  are not included in the time value given for this work operation
• Remove entire exhaust system
• Remove heat shield at rear.
• Remove UNDERBODY PANELLING

Slacken nut (1).

Take off holder (2).

Fig 1: Identifying Nut And Holder

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Fig 2: Identifying Right Compression Strut And Screws

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Slacken screws (1) on right compression strut (2), do not unscrew fully.

Tightening torque 33 33 2AZ .

Slacken screw (3) (do not unscrew fully).

Tightening torque 33 33 1AZ .

Slacken screws (1) on rear axle support at rear right (2), do not unscrew fully.

Tightening torque 33 33 1AZ .

Gently lower rear axle at rear right to make it easier to feed out refrigerant lines later.

Fig 3: Identifying Slacken Screws On Rear Axle Support

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Unlock and open respective clamp (1).

Fig 4: Identifying Respective Clamp

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Release screw (1).

Disconnect pressure line (2) from pressure line (3).

Installation: 

Replace sealing rings.

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

Fig 5: Identifying Pressure Line And Screw

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Unclip pressure line (1) from holder (2).

Fig 6: Identifying Pressure Line And Holder

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Release corresponding screw (1).

Tightening torque 64 53 5AZ .

Carefully detach respective refrigerant line (3) downwards from expansion valve (2).

Installation: 

Replace sealing rings.

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

Fig 7: Identifying Expansion Valve, Refrigerant Lines And Screws

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Unlock and open respective clamp (1).

Feed out corresponding refrigerant line (2) between vehicle underbody and rear axle support (3).

Fig 8: Identifying Rear Axle Support And Corresponding Refrigerant Line

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