A/C Compressor
A/C Compressor
• Depending on time period of production and on engine, compressor construction type may vary. Refer to Electronic Parts Catalog (ETKA).
• At the start of production, the A/C compressors manufactured by "Denso" (type "6 SEU 14") were installed. At a later point in time A/C compressors from other manufacturers (for example "Sanden", type "PXE 16" or "ZJX") can be installed.
• These A/C compressors are available as replacement parts with different oil fill capacities, therefore note capacity on A/C compressor. Refer to the Electronic Parts Catalog.
• Depending on A/C compressor type, different refrigerant oil fill capacities are designated for the refrigerant circuit. The reason for the different oil capacities in the A/C compressor for an otherwise identical refrigerant circuit lies in the design of the A/C compressor itself, note these oil capacities. Too much oil in the circuit leads to higher pressures and reduces cooling performance of the system. Too little oil may lead to lubrication problems in the compressor.
• If a new compressor has been installed or new refrigerant oil has been put into the A/C compressor (for example, after flushing refrigerant circuit), the A/C compressor must be turned by hand approximately 10 revolutions. This ensures that the A/C compressor is not damaged when activated.
Removing
- Discharge the refrigerant circuit.
- Disconnect refrigerant lines from A/C compressor. Refer to=> [ A/C Compressor Refrigerant Lines ] A/C Compressor Refrigerant Lines.
• The sequence is different and depends on the engine. On vehicles with a 3.2L MPI engine, the A/C compressor must first be removed from the bracket before refrigerant lines can be removed. It is possible to remove the refrigerant lines with the A/C compressor still installed on 2.0L TFSI vehicles.
- Remove the A/C compressor from the bracket. Refer to => [ A/C Compressor, Removing From Bracket ] A/C Compressor, Removing From Bracket or => [ A/C Compressor, Removing From Bracket ] A/C Compressor, Removing From Bracket.
Installing
Installation is carried out in the reverse order while noting the following:
• Coat the O-ring seals lightly with refrigerant oil prior to installation. Refer to=> [ Refrigerant Circuit O-rings ] Refrigerant Circuit O-rings.
• An uncertain quantity of refrigerant oil remains in a removed A/C compressor. Therefore, observe the notes for replacing the A/C compressor.
• Tightening torque; vehicles with a 4 or 6 cylinder engine. Refer to => [ A/C Compressor, Removing From Bracket ] A/C Compressor, Removing From Bracket. Vehicles with 5 cylinder engine, refer to => [ A/C Compressor, Removing From Bracket ] A/C Compressor, Removing From Bracket. Attach the refrigerant lines to the A/C compressor. Refer to => [ A/C Compressor Refrigerant Lines ] A/C Compressor Refrigerant Lines.
• Replace the O-ring seals on opened connection points, version, refer to Electronic Parts Catalog.
- Remove the A/C compressor from the bracket. Refer to => [ A/C Compressor, Removing From Bracket ] A/C Compressor, Removing From Bracket or => [ A/C Compressor, Removing From Bracket ] A/C Compressor, Removing From Bracket.
- After installing a new A/C compressor (or after charging compressor with cold refrigerant oil, such as, after flushing refrigerant circuit) run the A/C compressor through 10 rotations by hand after installing and before routing the ribbed belt.
• The A/C compressor on 5 cylinder vehicles have 2 ribbed belts. The A/C compressor has a belt pulley with a double belt guide. Refer to => [ A/C Compressor, Removing From Bracket ] A/C Compressor, Removing From Bracket.
- Mount the ribbed belt(s) on the ribbed belt pulley.
- Discharge and fill the refrigerant circuit.
- Install remaining components.
- 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.
• Note the information regarding operating the A/C system after filling.
• Rotating will prevent damage to the A/C compressor when starting the engine for the first from refrigerant oil that may be located in the compression chamber.
• Only start engine after refrigerant circuit has been assembled.
• If possible start engine only with a filled refrigerant circuit.
• Different A/C compressors, depending on production time period and on engine. Refer to=> [ Refrigerant Circuit Components Overview ] Refrigerant Circuit Components Overview and Electronic Parts Catalog (ETKA).
• The A/C compressor is always driven by pulley (there is no magnetic clutch). To prevent damage when the compressor is idling, it is lubricated by an internal oil circuit.
• The compressor has an internal oil circuit to ensure the A/C compressor is not damaged when refrigerant circuit is empty. Prerequisite for the internal lubrication is residual refrigerant oil in A/C compressor.
• The engine may only be started when the refrigerant circuit is installed correctly. 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.
• A/C Compressor Regulator Valve (N280) is not activated when the refrigerant circuit is empty and the A/C compressor idles with the engine. As there is no refrigerant in the circuit the oil required to lubricate is not fed to the A/C compressor.