Removing and installing air conditioner compressor - vehicles with 8-cyl. FSI/TFSI engine — AUDI

🧭 Before you start

Fits: Audi A6/A7 C7 (4G, 2011–2018); platform code 4X

• Opens: refrigerant (A/C)

Don't miss

• (Item 2) can be disregarded.
• Do not turn air conditioner compressor drive shaft (A).After unfastening the thread, the air conditioner compressor drive shaft (A) can be pushed into the drive gear through boot (E).
• Risk of damage to refrigerant lines and hoses.Do not stretch, kink or bend refrigerant lines and hoses. — Detach refrigerant lines from air conditioner compressor .
• The boot (E) is secured in position on the flange with a clamp to prevent it from slipping Electronic parts catalogue.Renew boot (E) if damaged.To secure clamp, use locking pliers for Phaeton steering boxVAS 6199 or similar.
• Do not turn air conditioner compressor drive shaft when tightening.After installation, check position of boot (E) on drive gear.After fitting drive shaft (A), check installation position of boot (E).

📋 Procedure

1. ⚠ Can only be opened or removed after refrigerant circuit has been discharged; take vehicle to a workshop equipped with the necessary tools where work can be performed by appropriately qualified personnel Air conditioner with refrigerant R134a87General information on air conditioner. — Discharge refrigerant circuit Air conditioner with refrigerant R134a87Refrigerant circuit.
2. ⚠ Danger of scalding from hot steam or hot coolant.The cooling system is pressurised when the engine is warm.To relieve pressure, cover coolant expansion tank cap with a cloth and open carefully. — Open cap (arrow) on coolant expansion tank.
3. Move front wheels to straight-ahead position.
4. Discharge refrigerant circuit Air conditioner with refrigerant R134a87Refrigerant circuit.
5. Remove engine mount 10Engine mounting; Removing and installing engine mounts.

6. Remove bolt (arrow).
7. Pull dipstick guide tube (1) out of sump (top section).
8. Remove top left coolant pipe 19Coolant pipes; Removing and installing coolant pipes.
9. Unplug electrical connector (3).
10. Lift retaining clip (1) and disconnect coolant hose. [Note: (Item 2) can be disregarded.]
11. Remove bolts (arrows) and detach engine support (left-side). [Note: For greater clarity, this illustration shows the engine support with the coolant pipe removed; however, the coolant pipe must be left in position.Depending on the version of the coolant pipe, it may be necessary to unfasten the coolant pipe from the engine and press it to the side slightly before removing the engine support.]
12. Using two open-end spanners, hold air conditioner compressor drive shaft (A) and turn air conditioner compressor drive unit (B) in direction of (arrow C). [Note: Do not turn air conditioner compressor drive shaft (A).After unfastening the thread, the air conditioner compressor drive shaft (A) can be pushed into the drive gear through boot (E).]
13. Mark electrical connector (1) for air conditioner compressor regulating valve N280 (to avoid possible interchange with other identical connectors). [Note: The connectors for air conditioner compressor regulating valve N280 and the electrical engine mounting are identical. If the connectors are interchanged, no entry is made in the event memory, but the air conditioner compressor is constantly activated and the evaporator may ice up.]
14. Remove electrical connector (1) for air conditioner compressor regulating valve N280 from bracket and unplug it.
15. Unscrew bolts (arrows) and detach air conditioner compressor.
16. ⚠ Risk of damage to refrigerant lines and hoses.Do not stretch, kink or bend refrigerant lines and hoses. — Detach refrigerant lines from air conditioner compressor .
17. Carefully slide air conditioner compressor towards front and remove downwards.
18. If necessary, install air conditioner compressor drive shaft (A) (in drive gear on engine) and check that it is attached properly and check corresponding boot (E). [Note: The boot (E) is secured in position on the flange with a clamp to prevent it from slipping Electronic parts catalogue.Renew boot (E) if damaged.To secure clamp, use locking pliers for Phaeton steering boxVAS 6199 or similar.]
19. Thoroughly clean contact surfaces (C) on air conditioner compressor.
20. Insert dowel sleeves (A) in air conditioner compressor (B). [Note: Make sure that the dowel sleeves are positioned correctly and that the contact surfaces are clean. Incorrectly fitted dowel sleeves or dirty/damaged contact surfaces could lead to misalignment between the air conditioner compressor and the engine. After a period of operation, misalignment will cause damage to the air conditioner compressor.When it is removed, the air conditioner compressor contains an indeterminate amount of refrigerant oil. For this reason it is important to observe the notes on renewing the compressor Air conditioner with refrigerant R134a87Renewing components of refrigerant circuit.]
21. After installing a new air conditioner compressor or pouring in fresh refrigerant oil (e.g. after cleaning the refrigerant circuit), turn the air conditioner compressor drive unit (B) at the air conditioner compressor 10 times by hand in direction of (arrow C) before tightening the air conditioner compressor drive shaft (A) to avoid damaging the compressor.
22. Hold air conditioner compressor drive shaft (A) with an open-end spanner and turn air conditioner compressor drive unit (B) in direction of (arrow D). [Note: Do not turn air conditioner compressor drive shaft when tightening.After installation, check position of boot (E) on drive gear.After fitting drive shaft (A), check installation position of boot (E).]
23. Install engine support and engine mount (left-side) 10Engine mountings; Exploded view - engine mountings.
24. Install top left coolant pipe 19Coolant pipes; Removing and installing coolant pipes.
25. Attach refrigerant lines to air conditioner compressor .
26. Evacuate and charge refrigerant circuit Air conditioner with refrigerant R134a87Refrigerant circuit.
27. Start up air conditioner after charging refrigerant circuit . [Note: Further notes on starting up air conditioner after installing air conditioner compressor Air conditioner with refrigerant R134a87General notes on air conditioning systems.]

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