Removing and installing compressor (vehicles with 4 or 6-cyl. engine) — AUDI

🧭 Before you start

Fits: Audi A6 C6 (4F, 2004–2011)

• Opens: refrigerant (A/C)
• Special tools named: VAS 5051
• Renewed: o-rings at opened connections

Don't miss

• Seal open pipes and connections at condenser with suitable caps (to prevent ingress of dirt and moisture).
• Also heed the notes on start-up of the air conditioner after charging Air conditioner with refrigerant R134a.

📋 Procedure

1. Drain refrigerant circuit Air conditioner with refrigerant R134a.
2. Detach refrigerant pipes from compressor .
3. Detach compressor from holder . [Note: Seal open pipes and connections at condenser with suitable caps (to prevent ingress of dirt and moisture).]
4. Attach the compressor to the holder . [Note: Tightening torques for bolts between compressor and holder The compressor removed contains an indeterminate amount of refrigerant oil. Attention is therefore to be paid to notes on compressor replacement Air conditioner with refrigerant R134a.Assemble refrigerant circuit before starting engine.Only start engine with refrigerant circuit full if at all possible.]
5. Replace O-rings at opened connections, version Electronic parts catalogue

6. Attach refrigerant pipes to compressor .
7. Before fitting poly V-belt, crank compressor 10 times by hand following installation (to prevent compressor damage on initial activation). [Note: Any refrigerant oil which may have collected in the compression chamber on removing the compressor or after pouring in fresh refrigerant oil (e.g. after blowing out the refrigerant circuit) is forced out of the compression chamber by the cranking action.Different compressors depending on country version and engine Electronic parts catalogueMoisten O-rings with small quantity of refrigerant oil before installing.The compressor is always driven by the pulley/drive unit (there is no magnetic clutch).Compressor is equipped with an "“internal oil circuit”" to prevent damage if refrigerant circuit is empty. This internal lubrication is only possible if there is still a residual quantity of refrigerant oil in the compressor. However, as there is no refrigerant available, the refrigerant oil required for compressor lubrication is not conveyed.Engine is not to be started unless refrigerant circuit has been properly assembled. If, for example, refrigerant pipes have not been connected to compressor, heat generation inside compressor with engine running may lead to destruction of compressor.Air conditioning system compressor regulating valve N280 is not actuated if refrigerant circuit is empty and compressor runs at idle with engine.]
8. Evacuate and fill refrigerant circuit Air conditioner with refrigerant R134a.
9. Interrogate fault memory of operating and display unit, Climatronic control unit J255 and erase any faults displayed "Guided fault-finding" function of vehicle diagnostic, testing and information system VAS 5051.
10. Start up the air conditioner after charging the refrigerant circuit . [Note: Also heed the notes on start-up of the air conditioner after charging Air conditioner with refrigerant R134a.]

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