V6
Refrigerant Lines at Compressor
• 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. Such internal heat generation results from the fact that - even with delivery near 0% - the compressor is confronted with a fixed resistance (sealed circuit).
• Close open lines and connections on A/C compressor using suitable caps (to prevent possible penetration of dirt and moisture).
• The following procedure describes removing and connecting of the refrigerant lines on a vehicle equipped with a 6 cylinder TDI engine. For vehicles with 6 TFSI engine, the A/C compressor may be dismantled and removed from the mount only when the refrigerant circuit is open. The FSI engine may have a few differences, but the refrigerant lines are removed and installed in the same manner.
Removing
- Switch off the ignition.
- Drain the refrigerant circuit.
- Remove the engine cover (this figure shows the engine cover in a TDI engine) - arrows -.
- Remove front noise insulation..
- Remove the bolts - 2 - and - 3 - and remove the refrigerant lines from the compressor.
Risk of damaging refrigerant lines and hoses.
• Do not stretch, kink or bend refrigerant lines and hoses.
• 6-cylinder TDI engine, bolts - 2 - and - 3 - are accessible from below and above.
• 6-cylinder TFSI engine, bolts - 2 - and - 3 - are accessible from above (between the left longitudinal member and the engine).
• Close open lines and connections on A/C compressor using suitable caps (to prevent possible penetration of dirt and moisture).
Installing
Installation is done is reverse order, observe the following:
- Replace the O-rings - D - and - C -. Refer to Electronic Parts Catalog (ETKA).
- Check the guide ring - F - on the connections for both refrigerant lines - B - and - C - for damage.
- Clean the refrigerant line and A/C compressor connections and check for damage.
• Do not use the O-rings from the sealing caps that are installed on the connections in the replacement compressor when installing the lines.
• Follow the instructions for installing the O-rings. Refer to => [ Refrigerant Circuit O-rings ] Refrigerant Circuit O-rings.
- Coat the O-rings with refrigerant oil before installing. Refer to => [ Refrigerant Circuit O-rings ] Refrigerant Circuit O-rings.
- Insert the respective O-ring - D - and - E - into the groove - G - on the connections for both refrigerant lines - B - and - C -.
- Insert both refrigerant line into each connection on the compressor.
- Tighten the bolts - 2 - and - 3 -.
• Tightening specification: 9 Nm (screws with an M6 thread) and 25 Nm (screws with an M8 thread).
• Following attachment of refrigerant pipes to compressor (and installation of compressor) check routing of pipes. They must be inserted in holders provided and not make contact with other components.
- Evacuate and fill the refrigerant circuit.
- Install the remaining removed components.
- Check the event memory of the front A/C display control head, the Climatronic control module (J255) , and erase any displayed malfunctions using the (Vehicle diagnostic tester) in Guided Fault Finding function.
- 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.