Compressor, Removing and Installing on Bracket
Compressor, Removing and Installing on Bracket
• On vehicles with 6 cylinder engine, the compressor can be removed and installed at the bracket without opening the refrigerant lines.
• If the vehicle has an 8 cylinder engine, it is necessary to open the refrigerant circuit in order to remove the A/C compressor. Refer to => [ Compressor ] Compressor.
• For vehicles with 6 cylinder engine, discharge refrigerant circuit for the removal only if the compressor is to be removed, only disconnect refrigerant hoses and refrigerant lines from compressor only when refrigerant circuit has been discharged.
• After removal fasten compressor to longitudinal using for example, a wire. Never leave hanging from refrigerant pipes.
• Before removing ribbed belt, mark the running direction with chalk or felt-tip pen, a reversed running direction on a used belt may destroy it.
• Depending on engine and country version, different compressors can be installed (6 or 8 cylinder engine, gasoline or diesel). Refer to the Electronic Parts Catalog.
• Do not bend, kink or stretch lines or hoses as refrigerant lines and refrigerant hoses may be damaged.
Removing
• Do not loosen refrigerant lines.
• An A/C compressor on a 6 cylinder TDI vehicle is shown in the illustration. The arrangement on other 6 cylinder engine versions deviates only slightly from this illustration. Refer to the Electronic Parts Catalog.
• Depending on version of vehicle, it may be necessary to push aside or disconnect individual hose lines that are routed in the vicinity of the compressor.
• As opposed to the description below, the compressor can also be removed upward when refrigerant circuit has been discharged on vehicles with 6 cylinder TDI engine. However, the power steering pump must be removed and refrigerant lines disconnected from compressor before the removal upward, refer to => [ Compressor Refrigerant Lines, Disconnecting and Connecting ] Compressor Refrigerant Lines, Disconnecting and Connecting.
- Remove noise insulation.
- Remove left front wheel housing liner (6 cylinder TDI engine only).
- Remove the air guide hose (6 cylinder TDI engine only) - arrows -.
- Mark running direction of ribbed belt - E - for example, using chalk.
- Release tension on ribbed belt - E - and remove it.
- Remove power steering pump (6 cylinder gasoline engine only).
- Disconnect the connector from the Refrigerant Temperature Sensor (G454) - 2 - (if equipped). Refer to => [ Refrigerant Temperature Sensor ] Refrigerant Temperature Sensor (G454).
• Do not disconnect refrigerant lines - 2 - and - 3 - from compressor as long as refrigerant circuit remains charged (if for example, intending only to loosen compressor from bracket).
• If compressor is to be removed, first discharge refrigerant circuit and only then disconnect refrigerant lines - 2 - and - 3 - from compressor => [ Compressor Refrigerant Lines, Disconnecting and Connecting ] Compressor Refrigerant Lines, Disconnecting and Connecting.
• Do not bend, kink or stretch lines or hoses as refrigerant lines and refrigerant hoses may be damaged.
- Remove retaining clamps - 1 - and - 5 -.
- Pull coolant hose out of retainer on longitudinal member.
- Mark the connector to A/C Compressor Regulator Valve (N280) - 1 - (for example, because of danger of interchanging with connector to electric engine mount).
• If connectors to A/C Compressor Regulator Valve and to electric engine mount are interchanged, no DTC is entered in DTC memory (the electrical values of these components are about the same), however the evaporator may ice-up since the compressor is actuated continuously.
- Unscrew three bolts - arrows -.
- Remove A/C compressor toward left wheel housing (6 cylinder TDI engine) or toward front (6 cylinder gasoline engine).
• Depending on the version of the engine (with or without lugs on the front left of the cylinder block), the A/C compressor for vehicles with a 6 cylinder TDI engine may only be removed from the top (for an engine with a large tab, there is too little room to remove the A/C compressor from underneath).
• Compressor bracket - D - remains in the vehicle.
Installing
Installation is carried out in the reverse order while noting the following:
• Always clean contact surfaces on bracket on compressor.
• Install the bushings - C - into the A/C compressor bracket. Be careful of the correct allocation because there are different versions.
• Install one washer each - B - at bolts - A -.
• Install bolts - A - (tightening torque 25 Nm).
• Before fastening the compressor, check that both bushings - C - in compressor bracket are seated correctly.
• After fastening the compressor, check installation position of refrigerant lines, lines must be engaged in bracket (if installed, depending on engine).
• After attaching compressor, also check refrigerant pipes and corresponding holders for adequate clearance with respect to other components, ensuring sufficient distance between belt, holder and pulley.
• Install the ribbed belt - E -.
- Install remaining components.
• Note tightening torques of the removed bolts and nuts.
• From MY 2012, for vehicles with a 6-cylinder TDI engine with running change, an additional chafe protection is installed on the low pressure refrigerant line. Make sure that the installation position for the chafe protection is correct. Refer to => [ Compressor Refrigerant Lines, Disconnecting and Connecting ] Compressor Refrigerant Lines, Disconnecting and Connecting.
- Check the DTC memory for the Climatronic Control Module and erase any faults displayed if necessary using the Vehicle Diagnosis, Testing and Information System VAS 5051 in the "Guided Fault Finding" function.