A/C System Components Outside Passenger Compartment
A/C System Components Outside Passenger Compartment
1 Sun roof with solar cells
• Checking function of solar cells. Refer to => [ Solar Roof Function ] Description and Operation
• Removing and installing.
• Depending on setting in MMI (Multi Media Interface), the sunroof closes as soon as front A/C control head Climatronic Control Module (J255) switches over to air recirculation mode automatic air recirculation via air quality sensor or manual air recirculation by operating the air recirculation button. This function is equipment-dependent, its introduction has not yet been finalized. => Owner's Manual
2 Forced air extractor
• Fitted on left and right beneath rear bumper
• Sealing lips of vent frame must move freely and close automatically
• To ensure proper functioning of passenger compartment ventilation, air ducts must not be blocked by luggage compartment lining
• Checking, refer to => [ Vent Frame, Checking ] Vent Frame, Checking
3 Condensate drain hose
• 1 condensate drain each for driver's and front passenger's side.
• Checking, refer to=> [ Condensate Drain Hose ] Description and Operation
4 Control Motor Door Motor (V113)
• With Recirculation Door Motor Position Sensor (G143)
• Removing and installing, refer to => [ Recirculation Door Motor ]
5 Fresh Air Intake Duct Temperature Sensor (G89)
• Removing and installing, refer to => [ Fresh Air Intake Duct ] Service and Repair
• Checking, Resistance Value Vehicle diagnosis, testing and information system VAS 5051 in the "Guided Fault Finding" function.
6 Air Flow Door Motor (V71)
• With Back Pressure Door Motor Position Sensor (G113)
• Removing and installing, refer to => [ Air Intake Shroud with Air Flow Door ]
7 Service connection
• Low pressure side
• For measuring and emptying.
• Cap with seal; always to be screwed on
8 Outside Air Temperature Sensor (G17)
• Removing bumper.
• Unplug connector at temperature sensor and unclip from mount in air duct
• Measured value of Outside Air Temperature Sensor (G17) is evaluated by Instrument Cluster Control Module (J285) and transmitted via Comfort CAN-Bus system to front A/C control head Climatronic Control Module (J255) => Vehicle Diagnosis, Testing and Information System VAS 5051 in the "Guided Fault Finding" function
9 Pump-valve unit
• Consists of Left Heat Regulating Valve (N175) and Right Heat Regulating Valve (N176) and Coolant Pump (V50)
• Checking function. refer to => [ Ventilation System Heat Output and Pump Valve Unit Function ] Ventilation System Heat Output and Pump Valve Unit Function
• Removing and installing, refer to => [ Pump Valve Unit ] Removal and Replacement
• Replace
10 Air Quality Sensor (G238)
• Function, refer to => [ Air Quality Sensor Function ] Description and Operation
• Checking, refer to => [ Air Quality Sensor, Checking ] Component Tests and General Diagnostics
• Removing and installing, refer to => [ Air Quality Sensor ] Removal and Replacement
• Depending on setting in MMI (Multi Media Interface), the sunroof closes as soon as front A/C control head Climatronic Control Module (J255) switches over to air-recirculation mode (automatic air recirculation via air quality sensor or manual air recirculation by operating the air recirculation button). This function is equipment-dependent, its introduction has not yet been finalized. => Owner's Manual
11 Plenum chamber water drain
• Checking, cleaning, removing and installing. Refer to=> [ Checking and Cleaning Plenum Chamber Water Drain ] Checking and Cleaning Plenum Chamber Water Drain
12 Heated Windshield (Z2)
• Actuation is effected via Heated Windshield Control Module (J505) (installed in luggage compartment on right beneath Battery (A). Refer to => [ Heated Windshield ] Heated Windshield
• Function, refer to => [ Heated Windshield ] Heated Windshield
• Removing and installing front windshield.
13 Union in Refrigerant Pipe with Restrictor
• Only open the threaded connection when the refrigerant circuit is empty (drain refrigerant circuit).
14 Service connection
• High pressure side
• For measuring, emptying and filling.
• Cap with seal; always to be screwed on
15 Reservoir
• Only remove when the refrigerant circuit is empty.
• Removing and installing, refer to => [ Reservoir ] Removal and Replacement
16 A/C Compressor Regulator Valve (N280)
• Checking activation and function, refer to => [ A/C Compressor Regulator Valve, Checking Activation Signal ] Testing and Inspection.
17 Compressor
• Removing compressor from bracket and re-installing in vehicles with 6 cylinder. engine, 8 cylinder MPI engine or 8 cylinder diesel engine. Refer to => [ Compressor, Removing from Bracket, 6 Cylinder, 8 Cylinder MPI and 8
Cylinder Diesel ] Service and Repair
• Removing compressor from bracket and re-installing in vehicles with 12 cylinder engine. Refer to => [ Compressor from Bracket, 12 Cylinder ] Service and Repair
• Compressor, removing and installing in vehicles with 8 cylinder FSI engine. Refer to=> [ Compressor, 8 Cylinder FSI ] Service and Repair
• Compressor, removing and installing in vehicles with 10 cylinder engine. Refer to => [ Compressor, S8 10 Cylinder ] Service and Repair.
• Refrigerant line, disconnecting from compressor and connecting. Refer to=> [ Refrigerant Lines, Disconnecting and Connecting from Compressor ] Removal and Replacement
• Compressor, removing and installing. Refer to=> [ A/C Compressor ] A/C Compressor
• Compressor with Driveshaft, Removing from Bracket and Installing, 8 Cylinder FSI or 10 Cylinder Engine. Refer to => [ Compressor Drive Unit ] Compressor Drive Unit
• Replacing compressor drive unit vehicles with 8 cylinder. FSI engine and 10 cylinder engine. Refer to => [ Compressor Drive Unit ] Compressor Drive Unit
• The type of compressor differs depending on the engine 6, 8 , 10 or 12 cylinder. Engine, diesel or gasoline engine.
• Ribbed Belt, Removing and Installing, Compressor with Belt Drive.
• Belt Pulley, Removing and Installing, Compressor with Belt Drive. Refer to => [ Compressor Pulley, Version 1 ] Service and Repair
• Different refrigerant oil capacities are designated depending on the compressor type ("6 SEU 14", "7 SEU 16" or " 7 SEU 17") => Refrigerant R134a - Servicing
18 High Pressure Sensor (G65)
• Function, removing and installing. Refer to => [ High Pressure Sensor ] Removal and Replacement
• The sensor measured value is displayed in the "Read measured value block" function for the Climatronic Control Module (J255) front A/C control head. Refer to => [ High Pressure Sensor Pressure Signal ] High Pressure Sensor Pressure Signal and vehicle diagnosis, testing and information system VAS 5051 in the "Guided Fault Finding" function.
19 Condenser
• Only remove when the refrigerant circuit is empty; bring the vehicle to a workshop with the necessary tools and qualified personnel => Refrigerant R134a - Servicing.
• Different versions of the power steering fluid cooler is installed too depending on vehicle equipment.
• Refrigerant lines, disconnecting and reconnecting. Refer to => [ Refrigerant Lines, Disconnecting and Connecting from Condenser ] Removal and Replacement
• Condenser, removing and installing. Refer to => [ Condenser ] Removal and Replacement
20 Coolant Fan (V7)
• Request to switch on coolant fan is transmitted to engine control module by front A/C control head Climatronic Control Module (J255) via CAN bus system. Engine Control Module (ECM) then actuates the fans or the Coolant Fan Control (FC) Control Module (J293)Vehicle Diagnosis, Testing and Information System VAS5051 in the "Guided Fault Finding" function.
• The respective Engine Control Module (ECM) switches Coolant Fans (via Coolant Fan Control (FC) Control Module (J293)) continuously to desired output. Vehicle Diagnosis, Testing and Information System VAS 5051 in the "Guided Fault Finding" function.
• Different versions are installed depending on vehicle equipment. .
• Check activation from the Climatronic Control Module (J255) front A/C control head read the measured value block Vehicle diagnosis, testing and information system VAS 5051 in the "Guided Fault Finding" function.
21 Fresh Air Blower Control Module (J126)
• Removing and installing. Refer to => [ Fresh Air Blower Control Module ] Fresh Air Blower Control Module
• Checking Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" function.
22 Fresh Air Blower (V2)
• Removing and installing, refer to => [ Fresh Air Blower ] Service and Repair
• Checking Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" function.
23 Dust and pollen filter
• Removing and installing, refer to => [ Dust and Pollen Filter ] Air Distributor Housing
• Follow the replacement intervals => maintenance tables.
• With active carbon filter element. Refer to => [ Dust and Pollen Filter ] Description and Operation
24 Label
• Indicates type of refrigerant and intended capacity
• The capacity of refrigerant R134a and additional information regarding work on the refrigerant circuit can be found in => Refrigerant.
•
• The label was discontinued on some vehicles from model year 2003.
25 Evaporator
• Only remove when the refrigerant circuit is empty; bring the vehicle to a workshop that has the necessary tools and qualified personnel.
• Removing and installing, refer to => [ Evaporator ] Removal and Replacement
• Clean air conditioning system evaporator with Ultrasonic HVAC Cleaning System (VAS 6189). Refer to => [ Cleaning Evaporator ] Cleaning Evaporator
26 Opening for recirculated-air mode