A/C Compressor Refrigerant Lines

A/C Compressor Refrigerant Lines

Special tools, testers and auxiliary items required

• Engine Bung Set (VAS 6122)

The A/C compressor could be damaged.

• Compressor is always driven when engine is running; there is no magnetic clutch. Engine is therefore not to be started unless refrigerant circuit has been properly assembled.

• For example; if the refrigerant lines are not connected to A/C compressor, when the engine is running the A/C compressor may heat up (via internal heat generation) so much that the A/C compressor will be damaged.

Removal






- Drain the refrigerant circuit.

Risk of damaging refrigerant lines and hoses.

• Do not stretch, kink or bend refrigerant lines and hoses.

- Unscrew the screws - 2, 4 - and remove the refrigerant lines - 1, 3 -.

- Seal open lines and connections with a clean plug from the (VAS 6122).

Installation






Installation is done in reverse order, observe the following:

• Tightening specification, refer to => [ Refrigerant Lines, Condenser, Expansion Valve, A/C Compressor Overview ] Refrigerant Lines, Condenser, Expansion Valve, A/C Compressor Overview.

- Replace the O-ring seals. Refer to Electronic Parts Catalog (ETKA).

- If present, check the alignment pin - 4 - for damage and proper seating.

- Check the guide ring - 2 - at the refrigerant line connection for damage.

- Insert the O-ring seal - 3 - in the groove - arrow - at the refrigerant line connection - 1 -.

• Do not use the O-ring seals from the sealing caps that are installed on the connections of the replacement A/C compressor.

• Coat the O-ring seals lightly with refrigerant oil prior to installation. Refer to => [ Refrigerant Circuit O-rings ] Refrigerant Circuit O-Rings.

• Check the O-ring seals for proper seating in the groove - arrow - of the respective refrigerant line.

• Following attachment of the refrigerant lines to the A/C compressor (and installation of A/C compressor), check the routing of the line. They must be inserted in the provided brackets and not come into contact with any other component.

- Insert the refrigerant lines - 1, 3 - into each connection on the A/C compressor.






- Tighten the screws - 2, 4 -.

- Evacuate and fill the refrigerant circuit.

- Operate the A/C system after filling the refrigerant circuit. Refer to => [ A/C System, Operating After Filling Refrigerant Circuit ] A/C System, Operating After Filling Refrigerant Circuit.

After completion of the repair work, perform the following work on the control head using the Vehicle Diagnostic Tester in the "Guided Fault Finding" function:

- Read out the event memory and erase any displayed entries.