A/C Unit
A/C Unit
=> [ Air Intake Unit Electrical Components and Connecting Elements ]
=> [ Connecting Elements to A/C Unit Doors ]
• When removing, mark the various control motors and their connecting elements between the door and control motor (there is risk of switch the connecting elements for one control motor with another).
• If the connecting elements are switched, the control motors with the incorrect connecting elements will not reach their specified end position and the "Upper or lower limit exceeded" malfunction will be displayed in the DTC memory after the basic setting.
• When removing, mark the various electrical connectors with the control motors (there is a risk of switching identical connectors and control motors).
• Several identical electrical connectors are installed on the A/C unit wiring harness. Mark the electrical connectors before disconnecting them (they could become mixed up).
• The control motor housings are currently identical but the shaft of each motor is different due to the different connecting elements so if they are switched, it may not be possible to install the connecting element.
• Various control motors are installed on the A/C unit and in the air intake unit. They have different electrical values (e.g. potentiometer with an adjustment range of 120° or 150°) and are different in the part number index (at start of production, without index, with index A or B). Mark the control motors before removing them (so they are not switched).
• Apply a small amount of Grease (G 000 150) to the connecting element guides, as well as the pins and toothed segments on the door levers.
• The A/C unit may only be removed when the refrigerant circuit has been discharged. Bring the vehicle to a workshop that has the necessary tools and where the work can be performed by qualified personnel. .
• Heating & A/C unit, removing and installing, refer to => [ A/C Unit ] Removal and Replacement.
• Evaporator and Heat Exchanger Housing, Disassembling and Assembling, refer to => [ Evaporator and Heat Exchanger Housing ] Evaporator and Heat Exchanger Housing.
1 Wiring Harness For Heating And A/C Unit
• Various identical electrical connectors and control motors are installed on the A/C unit wiring harness. Mark the electrical connectors before disconnecting them (they could become mixed up).
2 Clip
3 Air Distribution Housing
• Electrical Components, A/C Unit Installed, removing and installing, refer to => [ A/C Unit Electrical Components, Unit Installed ] A/C Unit Electrical Components, Unit Installed.
• Air Intake Unit Electrical Components and Connecting Elements, Removing and Installing, refer to => [ Air Intake Unit Electrical Components and Connecting Elements ].
4 Screw
5 Screw
6 Evaporator and Heat Exchanger Housing
• Disassembling and assembling, refer to => [ Evaporator and Heat Exchanger Housing ] Evaporator and Heat Exchanger Housing.
7 Screw
• There are different versions of the heater core and the associated coolant pipes. However, the version with an axial/radial seal - A - and - B - was not used on the Audi R8. A radial seal - D - and - E - is always installed.
• The coolant pipes may be secured to the heat exchanger in different ways:
• If they are secured with screw clamps - B -, remove the bolt - C - to open.
• If they are secured with clamping sleeves - A -, open the sleeve, for example with a screwdriver - C -.
Air Intake Unit Electrical Components and Connecting Elements
• When removing, mark the various control motors and their connecting elements between the door and control motor (there is risk of switch the connecting elements for one control motor with another).
• When removing, mark the various electrical connectors with the control motors (there is a risk of switching identical connectors and control motors).
• Several identical electrical connectors are installed on the A/C unit wiring harness. Mark the electrical connectors before disconnecting them (they could become mixed up).
• If the connecting elements are switched, the control motors with the incorrect connecting elements will not reach their specified end position and the "Upper or lower limit exceeded" malfunction will be displayed in the DTC memory after the basic setting.
• The control motor housings are currently identical but the shaft of each motor is different due to the different connecting elements so if they are switched, it may not be possible to install the connecting element.
• Various control motors are installed on the A/C unit and in the air intake unit. They have different electrical values (e.g. potentiometer with an adjustment range of 120° or 150°) and are different in the part number index (at start of production, without index, with index A or B). Mark the control motors before removing them (so they are not switched).
• Apply a small amount of Grease (G 000 150) to the connecting element guides, as well as the pins and toothed segments on the door levers.
1 Air Conditioner Unit
• Removing and installing, refer to => [ A/C Unit ] Removal and Replacement.
2 Connecting Element (Shaft/Control Motor)
• Mark before removing (they could be switched).
• Removing and installing, refer to => [ Connecting Elements to A/C Unit Doors ].
3 Center Vent Adjustment Motor (V102)
• With the Center Vent Motor Position Sensor (G138).
• Removing and installing, refer to => [ Center Vent Adjustment Motor ] Service and Repair.
4 Screw
5 Left Vent Temperature Sensor (G150)
• Removing and installing, refer to => [ Left Vent Temperature Sensor ] Temperature Sensors.
6 Connecting Element (To The Shaft)
• Mark before removing (they could be switched).
• Removing and installing, refer to => [ Connecting Elements to A/C Unit Doors ].
7 Connecting Element (To The Control Motor)
• Mark before removing (they could be switched).
• Removing and installing, refer to => [ Side Vent Motor ] Service and Repair.
8 Screw
9 Side vent motor (V262)
• With the Side Window Outlet Motor Position Sensor (G548).
• Removing and installing, refer to => [ Side Vent Motor ] Service and Repair.
10 Connecting Element (To The Shaft)
• Mark before removing (they could be switched).
• Removing and installing, refer to => [ Connecting Elements to A/C Unit Doors ].
11 Defroster Door Motor (V107)
• With the Defroster Door Motor Position Sensor (G135).
• Removing and installing, refer to => [ Defroster Door Motor ] Service and Repair.
12 Screw
13 Connecting Element (To The Shaft)
• Mark before removing (they could be switched).
• Removing and installing, refer to => [ Connecting Elements to A/C Unit Doors ].
14 Right Vent Temperature Sensor (G151)
• Removing and installing, refer to => [ Right Vent Temperature Sensor ] Temperature Sensors.
15 Evaporator Vent Temperature Sensor (G263)
• Removing and installing, refer to => [ Evaporator Vent Temperature Sensor ] Temperature Sensors.
16 Screw
17 Front Cold Air Door Motor (V197)
• With the Front Cold Air Door Motor Position Sensor (G315).
• Removing and installing, refer to => [ Front Cold Air Door Motor ] Service and Repair.
18 Connecting Element (To The Control Motor)
• Mark before removing (they could be switched).
• Removing and installing, refer to => [ Front Cold Air Door Motor ] Service and Repair.
19 Connecting Element (To The Shaft)
• Mark before removing (they could be switched).
• Removing and installing, refer to => [ Connecting Elements to A/C Unit Doors ].
20 Screw
21 Footwell Door Motor (V261)
• With the Footwell Door Motor Position Sensor (G468).
• Removing and installing, refer to => [ Footwell Door Motor ] Service and Repair.
22 Connecting Element (Shaft/Control Motor)
• Mark before removing (they could be switched).
• Removing and installing, refer to => [ Connecting Elements to A/C Unit Doors ].
Connecting Elements to A/C Unit Doors
Special tools, testers and auxiliary items required
• Release Tool (T40072)
Removing
- Remove the respective control motor, refer to=> [ Air Intake Unit Electrical Components and Connecting Elements ].
- Insert the (T40072) - A - in the openings - E - on the connecting element - C - as shown in the illustration.
• The (T40072) - A - is inserted at different depths for the different versions of the connecting elements - C -.
- Press the (T40072) toward the connecting element - C - and release the retainers - D - by turning the wheel - B - in the - direction of the arrow -.
- Remove the connecting element - C - from the A/C unit.
Installing
- Coat the bearing area - A - of the connecting element - C - in the A/C with Lubricant (G 000 150).
• The illustration shows the instrument panel vent door.
- Check the position of the door - E - in the A/C unit, making sure the door sits correctly in the second bearing area.
- Check the retaining tabs - D - on the connecting piece - C - for damage.
- Insert the connecting piece - C - in the mount - B - on the door - E -, paying attention to the grooves on the connecting piece - C - and the pins in the door mount.
- Check the connecting piece retainer - C - in the A/C unit.
- Check the door - E - and the connecting piece - C - for ease of movement.