Components outside Passenger Compartment
Components outside Passenger Compartment
1 Forced air extractor
• Installed on left and right beneath rear bumper
• Sealing lips of vent frame must move freely and close automatically
• In order for the vehicle interior ventilation to function properly, the air ducts that run through the luggage compartment trim must be unobstructed.
• Checking => [ Vent Frame, Checking ] Vent Frame, Checking
2 Heated windshield control module (J505)
• Use of the optional "heated front windshield" is open.
• In luggage compartment, right=> [ Heated Windshield ] Heated Windshield
The heated windshield control module (J505) exchanges information with the Climatronic Control Module (J255) A/C control head via the "Lin Bus" A/C data bus system => Vehicle Diagnosis, Testing and Information System VAS 5051.
3 Sunroof (with solar cells)
• Checking function of solar cells => [ Solar Sunroof Function ] Solar Sunroof Function
• Switch off the "solar operation" function MMI (Multi-Media Interface) => "Infotainment / MMI" Owner's Manual
• Depending on the adaptation of the Climatronic Control Module (J255) A/C/ control head, the "solar operation" function is switched off at low ambient temperatures (adaptation of the (J255)) => Vehicle Diagnosis, Testing and Information System VAS 5051. (read the measuring value block).
4 Heated Windshield (Z2)
• Use of the optional "heated front windshield" is open.
• Activation occurs via Heated Windshield Control Module (J505)=> Electrical Equipment and
The heated windshield control module (J505) exchanges information with the Climatronic Control Module (J255) A/C control head via the "Lin Bus" A/C data bus system => Vehicle Diagnosis, Testing and Information System VAS 5051 (read the measuring value block).
• Function => [ Heated Windshield ] Heated Windshield.
5 Plenum chamber water drain
• Checking, cleaning, removing and installing => [ Plenum Chamber Water Drain, Checking, Cleaning ] Plenum Chamber Water Drain, Checking, Cleaning
6 Pump-valve unit
• Consists of the Left Heat Regulating Valve (N175), Right Heat Regulating Valve (N176) and the Coolant Pump (V50)
• Check function => [ Ventilation System Heat Output and Pump Valve Unit Function, Checking ] Ventilation System Heat Output and Pump Valve Unit Function, Checking and => Vehicle Diagnosis, Testing and Information System VAS 5051 in the "Guided Fault Finding" function.
The pump valve unit components are activated via the Climatronic Control Module (J255), A/C control head => Vehicle Diagnosis, Testing and Information System VAS 5051 in the "Guided Fault Finding" function
• Removing and installing => [ Pump/Valve Unit ] Pump/Valve Unit
7 Label
• Indicates type of refrigerant and intended capacity.
• The label is affixed to the front hood (not present on all vehicles).
8 Air intake unit
• Removing and installing => [ Air Intake Unit ] Air Intake Unit
• Disassembling and assembling => [ Air Intake Unit ] Air Intake Unit
• Allocating air intake unit components => [ Air Intake Components, Allocating ] Air Intake Components, Allocating
• The following components are installed or removed in the air intake unit:
- Control motor Door Motor (V113)
- Fresh Air Intake Duct Temperature Sensor (G89)
- Air Flow Door Motor (V71)
- Air quality sensor (only in vehicles with (G238)(only in vehicles with "Comfort" version A/C system)
- Fresh Air Blower (V2)
- Fresh Air Blower Control Module (J126)
- Air intake unit water drain hose
• Depending on the version, for some countries with high dust levels, a dust filter is installed instead of the intake air grille, which prevents dust and sand from entering the fresh air blower.
9 Condenser
• May only be removed when refrigerant circuit has been removed; bring vehicle to a workshop that has the necessary tools and in which the work can be performed accordingly by qualified personnel => Refrigerant R134a - Servicing.
• Refrigerant lines, disconnecting and reconnecting => [ Refrigerant Lines, Disconnecting from Condenser and Connecting ] Refrigerant Lines, Disconnecting from Condenser and Connecting
• Condenser, removing and installing => [ Condenser ] Condenser
10 Outside Air Temperature Sensor (G17)
• The measured value of the Outside Air Temperature Sensor (G17) is evaluated by Instrument Cluster Control Module (J285) and transmitted via Comfort CAN-Bus system to Climatronic Control Module (J255) A/C control head=> Vehicle Diagnosis, Testing and Information System VAS 5051.
• Removing and installing:
- Unplug the connector at the temperature sensor
- Unclip the outside air temperature sensor (G17) from the mount.
• The figure shows the arrangement of the Outside Air Temperature Sensor (G17) for all vehicles except the Audi RS6 (in the Audi RS6 the (G17) is installed in the air duct to the left charge air cooler).
11 A/C Pressure/Temperature Sensor (G395)
• Function, removing and installing => [ A/C Pressure/Temperature Sensor ] A/C Pressure/Temperature Sensor
• The measured value of the sensor is displayed in the "Read measured value block"function of the Climatronic Control Module (J255) A/C control head=> Vehicle Diagnosis, Testing and Information System VAS 5051
12 Coolant Fan (V7)
• The request to switch on the fan is transmitted by the Climatronic Control Module (J255) A/C control module via the data bus system "Comfort" and "Drive") to the respective engine control device => Vehicle Diagnosis, Testing and Information System VAS 5051 (read measured value block).
• The respective Engine Control Module (ECM) actuates the Coolant Fan (V7) or the Coolant Fan Control Module (J293) continuously with the desired output.
• Different versions are installed depending on vehicle equipment.
• Activation is displayed at the Climatronic Control Module (J255) A/C control head in the measured value block => Vehicle Diagnosis, Testing and Information System VAS 5051 in the "Guided Fault Finding" function.
13 Compressor
• Different versions (depending on the engine).
• Removing compressor with pulley from bracket and reinstalling (vehicles with 6 cylinder engine) => [ Compressor with Pulley, Removing and Installing at Bracket ] Compressor with Pulley, Removing and Installing at Bracket
• Ribbed belt, removing and installing
• Ribbed Belt Routing
• Removing compressor with drive unit (shaft) from bracket and re-installing (vehicles with 8-cyl. engine) => [ Compressor, 8-Cylinder ]
• Compressor Drive Unit, Replacing => [ Compressor Drive Unit ] Compressor Drive Unit
• Refrigerant line, disconnecting from compressor and connecting => [ Refrigerant Lines, Disconnecting and Connecting at Compressor ] Refrigerant Lines, Disconnecting and Connecting at Compressor
• When installing refrigerant lines/hoses and pertaining bracket, make sure there is a sufficient gap between belt, bracket and belt pulley
• Compressor, Removing and Installing (vehicles with 6 cylinder engine) => [ Compressor, 6-Cylinder ]
• Compressor, Removing and Installing, (vehicles with 8 cylinder engine) => [ Compressor, 8-Cylinder ]
• Compressor, Removing and Installing, (vehicles with 10 cylinder engine) => [ Compressor, 10-Cylinder ] Compressor, 10-Cylinder
14 A/C Compressor Regulator Valve (N280)
• Check activation and function=> [ A/C Compressor Regulator Valve, Checking Activation Signal ] Testing and Inspection and => Vehicle Diagnosis, Testing and Information System VAS 5051 in the "Guided Fault Finding" function.
15 Reservoir
• May only be removed when refrigerant circuit has been discharged; bring vehicle to a workshop that has the necessary tools and in which the work can be performed accordingly by qualified personnel => Refrigerant R134a - Servicing.
• Removing and installing => [ Reservoir ] Service and Repair
16 Service connection
• Low pressure side
• To measure, drain and fill, bring the vehicle to a workshop that has the necessary tools and qualified personnel => Refrigerant R134a - Servicing.
• Cap with seal; always to be screwed on
17 Service connection
• High pressure side
• To measure, drain and fill, bring the vehicle to a workshop that has the necessary tools and qualified personnel => Refrigerant R134a - Servicing.
• Cap with seal; always to be screwed on
18 Union in refrigerant pipe (with restrictor)
• The threaded connection may only be open when refrigerant circuit is empty; bring vehicle to a workshop that has the necessary tools and in which the work can be performed accordingly by qualified personnel => Refrigerant R134a - Servicing.