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Home >> Audi >> 2012 >> Q5 2.0T >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> A/C Compressor >> Heating, Ventilation & Air Conditioning (1 Of 2) (As Of 06.2014) >> 87 Air Conditioning >> Overview - A/C System >> Overview - Components Outside Of Passenger Compartment >> Component Group "1"

Component Group "1"

NOTE:

The following illustrations show the location of the components on an Audi A5 Coupe; an Audi A5 Sportback, Audi A4, Audi Q5, etc. The location of the components varies slightly. The description of the components is not different; removing and installing is performed in the same way as on the Audi A5 Coupe.

Fig 1: Overview Of Components Outside of Passenger Compartment (Component Group "1")
GWWA87-10415Courtesy of AUDI OF AMERICA, LLC
  1. Rear Window Defogger -Z1-
    • The request to the rear window defogger is sent by the Climatronic Control Module -J255- A/C display and control head via the Data Bus to the Comfort System Central Control Module -J393-. The Rear Window Defogger -Z1- is activated by the Comfort System Central Control Module -J393-. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function.
    • Notes on function of the rear window defogger. Refer to REAR WINDOW DEFOGGER .
    • Rear window, removing and installing. Refer to REAR WINDOW, REMOVING AND INSTALLING .
  2. Comfort System Central Control Module -J393-
    • The Rear Window Defogger -Z1- is activated by the Comfort System Central Control Module -J393-. Refer to Electrical Equipment and Vehicle Diagnostic Tester in the "Guided Fault Finding  " function.
    • Removing and installing, checking. Refer to Electrical System and use the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function.
  3. Information Label
  4. Plenum Chamber Water Drains
  5. Coolant Shut-Off Valve
    • Depending on the engine, the Shut-Off valve is installed in the coolant feed and return line form the engine to the A/C heater core.
      NOTE:

      The vacuum from the Climatronic Coolant Shut-Off Valve -N422- activates the Shut-Off valve on start-of-production vehicles.

      On certain vehicles (depending on the engine), vacuum-controlled coolant Shut-Off valves were installed on vehicles without a "parking heater" from start of production. Shut-Off valves that are directly activated were installed later as a running change. Refer to the appropriate SYSTEM WIRING DIAGRAM and using the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function.

      This valve is referred to as a Climatronic Coolant Shut-Off Valve -N422- or a Coolant Shut-Off Valve -N82- depending on the engine version and on the time of production. efer to the appropriate SYSTEM WIRING DIAGRAM and use the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.

    • For the allocation of the coolant Shut-Off valve and of the Climatronic Coolant Shut-Off Valve -N422- on the engine or inside the plenum chamber. Refer to Coolant Shut-Off Valve -N82- /Climatronic Coolant Shut-Off Valve -N422- LOCATION, ACTIVATION AND FUNCTION .
  6. Climatronic Coolant Shut-Off Valve -N422- /Coolant Shut-Off Valve -N82-
    • The component location and the version of the Climatronic Coolant Shut-Off Valve -N422- may differ. It could be installed in the engine compartment or in the plenum chamber depending on the engine and the version of the vehicle. Refer to Coolant Shut-Off Valve -N82- /Climatronic Coolant Shut-Off Valve -N422- LOCATION, ACTIVATION AND FUNCTION .

      -- The Climatronic Coolant Shut-Off Valve -N422- is currently only installed on certain vehicles with a 4- or 6-Cylinder engine.

    • Activation and function. Refer to Coolant Shut-Off Valve -N82- /Climatronic Coolant Shut-Off Valve -N422- LOCATION, ACTIVATION AND FUNCTION .
    • For the allocation of the coolant Shut-Off valve and the Climatronic Coolant Shut-Off Valve -N422- inside the vehicle. Refer to Coolant Shut-Off Valve -N82- /Climatronic Coolant Shut-Off Valve -N422- LOCATION, ACTIVATION AND FUNCTION .
      NOTE:

      On certain vehicles (depending on the engine), vacuum-controlled coolant Shut-Off valves were installed on vehicles without a "parking heater" from start of production. Shut-Off valves that are directly activated were installed later as a running change. Refer to the appropriate SYSTEM WIRING DIAGRAM and use the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function.

      This valve is referred to as a Climatronic Coolant Shut-Off Valve -N422- or a Coolant Shut-Off Valve -N82- depending on the engine version and on the time of production. Refer to the appropriate SYSTEM WIRING DIAGRAM and use the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function.

      The Climatronic Coolant Shut-Off Valve -N422- /Coolant Shut-Off Valve -N82- is not installed in all versions with a 4-Cylinder or 6-Cylinder engine. Installation on vehicles without an "parking heater" depends also on the market.

      On vehicles with an engine with a regulated coolant circuit (for example, with a regulated coolant pump and a Cylinder Head Coolant Valve -N489-), no Climatronic Coolant Shut-Off Valve -N422- /Coolant Shut-Off Valve -N82- is currently installed. On an engine with a regulated coolant pump, the engine control module activates the coolant pump, and in doing so regulates the coolant circuit. Refer to Fig 1). Also, refer to COOLANT PUMP/THERMOSTAT for CALB, COOLANT PUMP/THERMOSTAT for CPNB, COOLANT PUMP/THERMOSTAT for CTUC and CTUD, or COOLANT PUMP/THERMOSTAT for CAEB, CPMB, CPMA and CHJA, .

  7. Outside Air Temperature Sensor -G17-
  8. Coolant Fan -V7- and Coolant Fan 2 -V177-
    • Different versions of the Coolant Fan -V7- and Coolant Fan 2 -V177- are installed depending on vehicle equipment.
    • The request to switch on the Coolant Fan -V7- is transmitted by the Climatronic Control Module -J255- A/C display and control head via the Data Bus to the engine control module. The engine control module then activates the fan(s) (Coolant Fan -V7- and Coolant Fan 2 -V177-) directly or via the Coolant Fan Control Module -J293-. Refer to the appropriate SYSTEM WIRING DIAGRAM and OVERVIEW - RADIATOR/COOLANT FAN for CALB, RADIATOR/COOLANT FAN for CTUC and CTUD, OVERVIEW - RADIATOR/COOLANT FAN for CHJA, CAEB, CPMB and CPMA, or OVERVIEW - RADIATOR/COOLANT FAN for CPNB .
    • Check the coolant fan activation by the Climatronic Control Module -J255- A/C display and control head. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function.
    • The respective engine control module switches, for example, the Coolant Fan -V7- and Coolant Fan 2 -V177- (directly or via the Coolant Fan Control Module -J293-) continuously to the desired output (depending on engine type). Use the Vehicle Diagnostic Tester in the "Guided Fault Finding  " function and refer to the appropriate SYSTEM WIRING DIAGRAM.
  9. Air Quality Sensor -G238- /Humidity Sensor In Fresh Air Intake Duct -G657-
    • Different version. Allocate correct version.
      NOTE:

      There are different versions depending on the vehicle date of manufacture and the A/C system version ("Basis" or "Convenience") is installed. The "Basis" A/C system does not have a humidity sensor in the Humidity Sensor in Fresh Air intake Duct -G657- /Air Quality Sensor -G238- until the MY 2012 changeover. From MY 2012 it has a humidity sensor in Humidity Sensor in Fresh Air intake Duct -G657- without an Air Quality Sensor -G238- (black housing). From MY 2012, the "Convenience" A/C system has an Air Quality Sensor -G238- without a Humidity Sensor in Fresh Air intake Duct -G657-. From this change, a Humidity Sensor in Fresh Air intake Duct -G657- is installed with an Air Quality Sensor -G238- (brown housing).

      Only vehicles with the "Convenience" A/C system have an Air Quality Sensor -G238- without a Humidity Sensor in Fresh Air intake Duct -G657- (from start of production up the changeover). Refer to DISPLAY AND CONTROL HEAD LOCATION .

      From MY 2012, the vehicle version was changed-over as a running change beginning with Audi A4 and Audi A5. Refer to DISPLAY AND CONTROL HEAD LOCATION . Vehicles, built before the changeover and with the "Convenience" A/C system, have an Air Quality Sensor -G238- (not installed on the "Basis" version). For vehicles built since this changeover (and for the Audi Q5 Hybrid), a Humidity Sensor in Fresh Air intake Duct -G657- is installed on the "Basis" version and a Humidity Sensor in Fresh Air intake Duct -G657- with the Air Quality Sensor -G238- is installed on vehicles with the "Convenience" version.

    • Function. Refer to Air Quality Sensor -G238-, FUNCTION .
    • Function. Refer to Humidity Sensor In Fresh Air Intake Duct -G657- FUNCTION .
    • Checking. Refer to Air Quality Sensor -G238-, CHECKING .
    • Checking. Refer to Humidity Sensor in Fresh Air intake Duct -G657-, CHECKING .
    • Removing and installing. Refer to Air Quality Sensor -G238- /Humidity Sensor In Fresh Air Intake Duct -G657-, REMOVING AND INSTALLING .
    • The Vehicle Electrical System Control Module -J519- evaluates the measured value from the Air Quality Sensor -G238- /Humidity Sensor in Fresh Air intake Duct -G657- and then transmits it to the Climatronic Control Module -J255- display and control head via the Data Bus. The Climatronic Control Module -J255- display and control head switches, for example, to recirculating air mode when requested, if there is no Shut-Off condition present. Use the Vehicle Diagnostic Tester in the "Guided Fault Finding" function.
  10. Fresh Air Intake with Intake Grille
    • Check cowl panel trim with the cover for the fresh air intake for correct installation and damage. Check the seals between the fresh air intake cover, the cowl panel trim and the window cross member for damage and proper fit. These seals prevent water from entering between the window cross member and the cowl panel trim and running into the A/C intake shroud. Refer to PLENUM CHAMBER COVER, REMOVING AND INSTALLING .
    • Removing and installing. Refer to FRESH AIR INTAKE, REMOVING AND INSTALLING and PLENUM CHAMBER COVER, REMOVING AND INSTALLING .
    • Make sure the intake grille fits correctly. The intake grille prevents foreign objects such as leaves from getting into the A/C intake shroud.
    • Depending on the version, for some countries with high dust levels (for example China), a filter is installed instead of intake air grille, which prevents dust and sand from entering the fresh air blower.
    • Removing and installing. Refer to FRESH AIR INTAKE, REMOVING AND INSTALLING .
      NOTE:

      The fresh air intake shaft may have an additional cover with a rain water drain channel depending on the version of the vehicle and the plenum chamber cover installed. Refer to FRESH AIR INTAKE, REMOVING AND INSTALLING .

  11. Forced Air Extraction
    • A forced air extraction vent is installed at left and right under rear bumper.
    • Sealing doors on air extraction vent must be able to move freely and close automatically.
    • In order for the passenger compartment ventilation to function properly, the air ducts that run through the luggage compartment trim must be unobstructed.
    • Checking. Refer to PASSENGER COMPARTMENT FORCED AIR EXTRACTION, CHECKING .
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