Detaching air intake box from heater and air conditioning unit/attaching — AUDI

🧭 Before you start

Fits: Audi A4 B9 (8W, 2015–)

• Opens: refrigerant (A/C)

Don't miss

• Mark the connectors at the control motors at the air intake box and unplug Exploded view - control motors at air intake housing.
• Mark the routing of the wiring harness (A) at the air intake box (C) (or take a photograph as record for example) and detach from the air intake box Exploded view - heater and air conditioning unit.

🔩 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 the ignition.
2. Drain the refrigerant circuit Air conditioner with refrigerant R134a87Refrigerant circuit.
3. Remove the front heater and air conditioning unit Removing and installing heater and air conditioning unit.
4. Detach the noise insulation cover and insulating mat from the air intake box (C). Exploded view - front heater and air conditioning unit
5. Mark the connectors at the control motors at the air intake box and unplug Exploded view - control motors at air intake housing.

6. Mark the routing of the wiring harness (A) at the air intake box (C) (or take a photograph as record for example) and detach from the air intake box Exploded view - heater and air conditioning unit.
7. Screw out the bolts (B) (tightening torque 1 Nm). — 1 Nm (0.7 lb-ft)
8. Separate the air intake box (C) from the evaporator housing (D) of the heater and air conditioning unit Exploded view - heater and air conditioning unit.
9. Check the insulating mat (E) in the evaporator housing (D) of the heater and air conditioning unit for damage, dirt (odour) and correct installation.
10. Check the connection points between the air intake box (C) and the evaporator housing (D) of the heater and air conditioning unit (tongue-and-groove joint) for damage and apply a small quantity of silicone grease for example to the connection points for fine sealing Exploded view - heater and air conditioning unit.
11. Perform basic setting and final control diagnosis for the air conditioner "“Guided fault-finding”" mode. [Note: The control motors on this vehicle are equipped with electronics. A new control motor only learns its position at the heater and air conditioning unit in the course of basic setting and can then be actuated by the front air conditioner operating and display unit E87 (all control motors are identical at present) "“Guided fault-finding”" mode.During basic setting, the control motors are assigned and adapted in accordance with the series connection of the wiring. If the sequence is not as specified, the matching of the control motors and thus flap control will not be correct Overview of control motors of air conditioner.]
12. Start up the air conditioner after charging the refrigerant circuit Starting up air conditioner after charging refrigerant circuit. [Note: Also heed the information on start-up of the air conditioner after charging Air conditioner with refrigerant R134a87General information on air conditioner.]
13. Interrogate the event memory of E87 and erase any faults displayed "“Guided fault-finding”" mode.

Other AUDI procedures

• Removing and installing toothed belt – Audi · 56 torque figures
• Removing engine – Audi A8 D3 · 41 torque figures
• Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
• Installing engine – Audi A8 D4 · 36 torque figures
• Removing and installing camshaft timing chain · 29 torque figures
• Adjusting rear door window – Audi A6/A7 C7 · 1 torque figures
• Checking delivery pressure of power steering pump (vehicles with 6-cylinder 2.4 ltr., 2.8 ltr., 3.2 ltr. petrol and 3.0 ltr. TFSI engine)
• Removing and installing vacuum pump (2.0 ltr. petrol engine)
• Removing and installing reservoir – Audi A6 C6
• Removing and installing connection for external audio sources R199 AMI (MMI) · 1 torque figures