A5: Heating, ventilation, air conditioning system

Also for this vehicle: A5 Cabriolet (8F7) L4-2.0L Turbo (CAEB) (2011), A5 Cabriolet L4-2.0L Turbo (CAEB) (2010), A5 Quattro Coupe (8T3) L4-2.0L Turbo (CAEB) (2011), A5 Quattro Coupe L4-2.0L Turbo (CAEB) (2010), A5 Quattro Coupe V6-3.2L (CALA) (2009).

Choose Sections to see everything in a chapter, or a chapter title to start at its first page.

1. 01Running gearRunning gear: Sections
2. 02BodyBody: Sections
3. 03Power unitPower unit: Sections
4. 04Power transmissionPower transmission: Sections
5. 05Vehicle electricsVehicle electrics: Sections
6. 06Heating, ventilation, air conditioning systemHeating, ventilation, air conditioning system: Sections
   • Auxiliary heater › Aux. heater/heater booster39 pages

     • Repairing auxiliary heater5 pages

       • Overview

       • Contact corrosion
       • Notes on auxiliary heater
       • Notes on auxiliary heater operation on vehicles with diesel engine
       • Notes for vehicles with a start/stop system
     • Safety precautions when working on vehicles fitted with auxiliary heater
     • Checking CO2 content in exhaust gas of auxiliary heater
     • Checking electrical components of auxiliary heater
     • Rules for cleanliness when working on auxiliary heater (and fuel system)
     • Removing and installing auxiliary heater
     • Diverting fuel for auxiliary heater
     • Block diagram of components for auxiliary heater in vehicle
     • Dismantling and assembling auxiliary heater
     • Notes on general repair work on vehicles fitted with auxiliary heater
     • Incorporation of auxiliary heater into coolant circuit5 pages

       • Overview

       • Incorporation of auxiliary heater
       • Removing and installing circulation pump V55
       • Operation of heater coolant shut-off valve N279
       • Removing and installing heater coolant shut-off valve N279
     • Detaching and attaching auxiliary heater add-on components5 pages

       • Overview

       • Exploded view of auxiliary heater add-on components
       • Removing and installing intake air noise insulation
       • Removing and installing auxiliary heater exhaust system
       • Removing and installing holder and add-on components of auxiliary heater
     • Functional description of auxiliary heater11 pages

       • Overview

       • Operating sequence7 pages

         • Overview

         • Requirements for the sequence described on the following pages
         • Activation of auxiliary heating
         • Auxiliary heater heating mode
         • Deactivation of auxiliary heating
         • Auxiliary ventilation
         • Measured values and components monitored during operating sequence
       • Sequence with required heat output between 50 and 100 %
       • Sequence with required heat output less than 50 %
       • Actuation of heater coolant shut-off valve N279
     • Block diagram of auxiliary heater2 pages

       • Overview

       • Incorporation of auxiliary heater into vehicle electrical system
     • Block diagram of auxiliary heater actuation with remote control2 pages

       • Overview

       • Fitting location for auxiliary heating radio controlled receiver R64
   • Air conditioner with refrigerant R134a › Air conditioner33 pages

     • Warning instructions when working on vehicles with high-voltage system
     • Problems with refrigerant circuit2 pages

       • Overview

       • Possible complaints about refrigerant circuit
       • Possible complaints about refrigerant circuit
     • Checking pressures
     • Connecting air conditioner service station
     • Laws and regulations
     • Test equipment and tools
     • General information on refrigerant circuit
     • Renewing components of refrigerant circuit
     • Refrigerant circuit22 pages

       • Overview

       • Important repair notes for air conditioning systems
       • Converting refrigerant circuits from refrigerant R12 to refrigerant R134a
       • Working with the air conditioner service station9 pages

         • Overview

         • Important notes for working with the air conditioner service station
         • Connecting air conditioner service station for measuring and testing
         • Discharging refrigerant circuit with air conditioner service station
         • Evacuating refrigerant circuit with air conditioner service station
         • Charging refrigerant circuit with air conditioner service station
         • Starting up air conditioner after charging
         • Pouring refrigerant into reservoir (charging cylinder or storage vessel) of air conditioner service station
         • Discharging air conditioner service station
       • Blowing out refrigerant circuit with compressed air and nitrogen2 pages

         • Overview

         • Blowing out refrigerant circuit
       • Flushing (cleaning) refrigerant circuit with refrigerant R134a4 pages

         • Overview

         • Block diagrams for various flushing circuits
         • Flushing electrically driven air conditioner compressor (removing refrigerant oil)
         • Adapters for connecting flushing circuits
       • Tracing leaks in refrigerant circuit4 pages

         • Overview

         • Tracing refrigerant circuit leaks with electronic leak detector (e.g. V.A.G 1796)
         • Tracing leaks in refrigerant circuit with leak detection system VAS 6201
         • Establishing leaks by way of vacuum test with air conditioner service station or nitrogen pressure test
     • General information on air conditioning systems
     • Capacities for refrigerant R134a, refrigerant oil and approved refrigerant oils
   • Air conditioning › Air conditioner29 pages

     • Safety precautions when working on vehicles fitted with an air conditioner and for handling refrigerant7 pages

       • Overview

       • Safety precautions when handling refrigerant
       • Safety precautions for vehicles with a start/stop system
       • Draining refrigerant circuit
       • Working on refrigerant circuit
       • Painting work on vehicles fitted with an air conditioner
       • Further information on air conditioner
     • Replacing air conditioner compressor pulley
     • Block diagram of air distribution system
     • Checking cooling output of air conditioner (not for vehicles with a high-voltage system)
     • Warning notices for working on vehicles with a high-voltage system3 pages

       • Overview

       • Working on vehicles with a high-voltage system (hybrid vehicles)
       • Visual inspection of high-voltage components and cables for damage
     • Checking cooling output of air conditioner (vehicles with a high-voltage system only)
     • Notes on general repairs
     • Removing and installing heat exchanger of air conditioning unit
     • Detaching refrigerant lines from air conditioner compressor/attaching
     • Dismantling and assembling air conditioning unit
     • Components for control and regulation of air conditioner not located in passenger compartment
     • Components for control and regulation of air conditioner located in passenger compartment2 pages

       • Overview

       • Removing and installing air conditioner operating and display unit, Climatronic control unitJ255
       • Removing and installing air conditioner operating and display unit, Climatronic control unitJ255
     • Servicing refrigerant circuit
     • Removing and installing air conditioner compressor
     • Checking heat output of air conditioner and actuation of temperature flaps5 pages

       • Overview

       • Prerequisites for checking heat output and actuation of temperature flaps of air conditioner
       • Checking heat output and actuation of temperature flaps of air conditioner3 pages

         • Overview

         • Checking heat output and actuation of temperature flaps (air conditioner of ?Basic? type)
         • Checking heat output and actuation of temperature flaps (air conditioner of ?Deluxe? type)
     • Capacities
     • Components of air conditioning unit and air intake box