64 53 517 Removing and installing/replacing desiccant insert for heating and air conditioning system

WARNING: Danger of injury!
Refrigerant circuit is under high pressure!
Follow safety information for handling R 134a tetrafluorethane refrigerant.
Avoid contact with refrigerant and refrigerant fluid.
Follow safety information for handling refrigerant fluid.

IMPORTANT: Risk of damage!
Restart engine only when air conditioning system has been correctly filled.
Follow notes for replacing desiccant cartridge.

NOTE: Follow notes for opening and replacing parts in refrigerant circuit.
If air conditioning system is opened for more than 24 hours:
Replace desiccant insert for heating and air conditioning system.

IMPORTANT: The desiccant insert can only be replaced in vehicles with production dates up to 12/08!
In vehicles after 12/08, the heating and air conditioning system capacitor must be replaced!

Necessary preliminary work:

Release screws (1).

Tightening torque 17 10 2AZ .

Fig 1: Identifying Screws

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Carefully pull capacitor (1) with dryer flask (2) forward out of left module carrier (3).

For further operation, protect cooling fins between capacitor and radiator, for example with a cloth (2).

Cloth (2) simultaneously serves as a fixture.

If necessary, pierce label on dryer flask.

Fig 2: Identifying Capacitor With Dryer Flask And Left Module Carrier

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NOTE: For purpose of clarity capacitor shown removed in following work steps.

Remove protective cap (1) from capacitor for the heating and air conditioning system (2).

Fig 3: Identifying Air Conditioning System And Protective Cap

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Press sealing cap (1) inwards and remove circlip (2).

Fig 4: Pressing Sealing Cap

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Remove the sealing cap (2) from capacitor of the heating and air conditioning system (3) with an inserted screw (1).

Fig 5: Removing Sealing Cap From Heating And Air Conditioning System Capacitor

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Installation note:

Renew sealing rings (1) of sealing cap (2).

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

Fig 6: Installing Sealing Rings Using Special Tool (00 9 030)

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Remove desiccant insert for heating and air conditioning system (1) in direction of arrow from capacitor of the heating and air conditioning system (2).

Fig 7: Removing Desiccant Insert For Heating And Air Conditioning System

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NOTE: If the heating and air conditioning system remains open for longer than one hour, the refrigerant lines must be sealed off with seal plugs.
In event of warranty application, seal pipe aperture with seal plugs of new dryer flask.

After installation

EVACUATE AND FILL HEATING AND AIR CONDITIONING SYSTEM