Auxiliary belt replacement: Detaching and attaching air conditioner compressor at bracket (mechanically driven air conditioner compressor) - vehicles with 4-cyl. engine — AUDI

🧭 Before you start

Fits: Audi A5 (8T, 2007–2016), Audi Q5 (8R, 2008–2017), Audi A5 Cabriolet (8F), Audi A4 B8 (8K, 2007–2015); platform code 83

• Special tools named: VAS 5051
• Also covered elsewhere: Electronic parts catalogue

Don't miss

• Mark direction of poly V-belt 13Cylinder block (pulley end); Removing and installing poly V-belt.

🔩 Torque settings

Values can differ between engine variants — check the code stamped on your block.

ℹ️ Always cross-check the exact figure against your vehicle's factory manual before final tightening — a wrong torque can damage the engine. These values are extracted from workshop data and may not cover every variant or revision.

📋 Procedure

1. Switch off ignition.
2. Remove noise insulation (front) General body repairs, exterior66Noise insulation; Exploded view - noise insulation.
3. Mark direction of poly V-belt 13Cylinder block (pulley end); Removing and installing poly V-belt.
4. Detach poly V-belt (A)13Cylinder block (pulley end); Removing and installing poly V-belt.
5. Unplug electrical connector (A).

6. Unscrew bolts (B) for air conditioner compressor.
7. Detach air conditioner compressor and swivel it away from engine as far as possible without kinking or straining refrigerant hoses.
8. Attach air conditioner compressor to vehicle (e.g. with a piece of wire) so that refrigerant hoses are not kinked or strained. [Note: If the air conditioner compressor cannot be swivelled far enough away from the engine, the compressor must be removed completely .Depending on the engine (petrol or diesel), the air conditioner compressor must be removed from the top or bottom. If the air conditioner compressor is removed from the top, it may be necessary to unfasten the coolant expansion tank from the vehicle and release the coolant lines from the brackets (do not open coolant circuit) and swivel them to the side slightly Engine, mechanics19Coolant pipes.]
9. ⚠ Risk of damage to refrigerant lines and hoses.Do not stretch, kink or bend refrigerant lines and hoses. — Before securing the air conditioner compressor, check the position of both dowel sleeves (A) in the bracket or the compressor (B). [Note: There are different versions of the dowel sleeves (A) (different length); for correct version refer to Electronic parts catalogue.Make sure that bushes (A) are correctly positioned and contact surfaces are clean. Incorrectly fitted bushes or dirty/damaged contact surfaces (C) at the bracket or air conditioner compressor could lead to misalignment between the compressor and engine. After a period of operation, misalignment can cause damage to the poly V-belt or the air conditioner compressor.]
10. Fit bolts (A), (B) or (C).
11. ⚠ Different bolts and different tightening torques (depending on engine and production period)Ensure correct allocation Electronic parts catalogue.Use aluminium bolts only once; they must always be renewed (in this case: item (A)).Tightening torque for aluminium bolts (in this case item (A)): 8 Nm +180°Tightening torque for steel bolts (in this case (B) and (C)): 25 Nm — Tighten bolts (arrows). — 8 Nm (5.9 lb-ft) + 180°
12. Plug in electrical connector (1) at air conditioner compressor regulating valve N280.
13. Position poly V-belt on poly V-belt pulley 13Cylinder block (pulley end); Removing and installing poly V-belt. [Note: After attaching air conditioner compressor, check routing of refrigerant lines. They must be inserted in the brackets provided (if fitted, depends on engine).Check that refrigerant lines and corresponding brackets have adequate clearance to other components, ensuring sufficient distance between belt, bracket and pulley.]
14. Interrogate event memory of operating and display unit (Climatronic control unit J255) and erase any faults displayed Vehicle diagnostic, testing and information system VAS 5051 ("Guided Fault Finding").

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