Automatic Climate Control components in passenger compartment, servicing
- After performing repairs, always check and erase the DTC memory, perform basic setting and check coding of A/C control head -E87-.
- A/C system cooling performance: See «A/C REFRIGERANT SYSTEM, TESTING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning) .
- A/C system servicing: See «A/C SYSTEM REFRIGERANT SYSTEM, SERVICING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning__ac-system-refrigerant-system-servicing) .
- All components identified with an asterisk (*) are actuated during output Diagnostic Test Mode (DTM). See «OUTPUT DIAGNOSTIC TEST MODE (DTM) (FUNCTION 03)»(/audi/a8/d2-1999-2002/remont/heated-glassdefoggers/#on-board-diagnostic-obd-hvac-can-defrosters__output-diagnostic-test-mode-dtm-function) .
- An electrical test is possible at all the components identified with two asterisks (**). See «AUTOMATIC CLIMATE CONTROL SYSTEM, ELECTRICAL»(/audi/a8/d2-1999-2002/remont/heated-glassdefoggers/#on-board-diagnostic-obd-hvac-can-defrosters) .
- The air outlets to the windshield (defrost) can only be replaced if the instrument panel is removed. Separate instrument panel and instrument panel cross member.
- Changes to model year 2000 vehicles: See «CLIMATE CONTROL COMPONENTS IN PASSENGER COMPARTMENT, UPDATES FROM M.Y. 2000»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning__climate-control-components-in-passenger-compartment) .
Note. The following list refers to items in (Scheme 68).
- Kick-down switch Depending on vehicle equipment and momentary vehicle speed, A/C clutch is switched off on acceleration by either Engine Control Module (ECM) or Transmission Control Module (TCM). See «READ MEASURING VALUE BLOCK (FUNCTION 08)»(/audi/a8/d2-1999-2002/remont/heated-glassdefoggers/#on-board-diagnostic-obd-hvac-can-defrosters__read-measuring-value-block-function-08) .
- A/C control head -E87- Allocation. See «A/C CONTROL HEAD -E87-, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning__ac-control-head-e87-removing-and) . Removing and installing. See «A/C CONTROL HEAD -E87-, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning__ac-control-head-e87-removing-and) . Replacing bulbs of A/C control head panel. See «A/C CONTROL HEAD -E87-, REPLACING BULBS»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning) . NOTE: Vehicles with Nippondenso compressor may only have A/C control heads beginning with Index "C" installed. See «VAG 1551 ((VAG 1552) SCAN TOOL (ST), CONNECTING AND SELECTING FUNCTIONS»(/audi/a8/d2-1999-2002/remont/heated-glassdefoggers/#on-board-diagnostic-obd-hvac-can-defrosters) . Depending on the equipment level of the vehicle, different versions of A/C control head -E87- are installed (with and without sensor for air quality, etc.). See «A/C CONTROL HEAD -E87-, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning__ac-control-head-e87-removing-and) .
- Instrument panel interior temperature sensor -G56-** Removing and installing. See «INSTRUMENT PANEL INTERIOR TEMPERATURE SENSOR -G56-, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning__instrument-panel-interior-temperature-sensor-g56) .
- Data Link Connector (DLC) Connecting VAG 1551 and testing A/C system. See «VAG 1551 ((VAG 1552) SCAN TOOL (ST), CONNECTING AND SELECTING FUNCTIONS»(/audi/a8/d2-1999-2002/remont/heated-glassdefoggers/#on-board-diagnostic-obd-hvac-can-defrosters) .
- Lower air outlet in right (left) of instrument panel Removing and installing. See «LOWER AIR OUTLET IN RIGHT (LEFT) OF INSTRUMENT PANEL, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning) .
- Upper air outlet in right (left) of instrument panel Removing and installing. See «UPPER AIR OUTLET IN RIGHT (LEFT) OF INSTRUMENT PANEL, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning) .
- Side window air outlet in right (left) of instrument panel Removing and installing. See «SIDE WINDOW AIR OUTLET IN RIGHT (LEFT) OF INSTRUMENT PANEL, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning__side-window-air-outlet-in-right) .
- Right center vent switch -F184-** Removing and installing air outlet. See «CENTER AIR OUTLET IN INSTRUMENT PANEL, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning__center-air-outlet-in-instrument-panel) .
- Center vent position sensor -G142-** Removing and installing air outlet. See «CENTER AIR OUTLET IN INSTRUMENT PANEL, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning__center-air-outlet-in-instrument-panel) .
- Sunlight photo sensor - G107-** Removing and installing. See «SUNLIGHT PHOTO SENSOR -G107-, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning) .
- Left center vent switch - F183-** Removing and installing air outlet. See «CENTER AIR OUTLET IN INSTRUMENT PANEL, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning__center-air-outlet-in-instrument-panel) .
- Auto check system with outside air temperature display -G106-* Outside air temperature supplied by -E87- is only displayed when a Drive mode is engaged. For vehicles with A/C control head -E87- with part number as of index "M", the displayed temperature is calculated directly in the instrument cluster and displayed there with the selected unit of °C or °F. NOTE: If readout is faulty, test measured values of temperature sensors. See «READ MEASURING VALUE BLOCK (FUNCTION 08)»(/audi/a8/d2-1999-2002/remont/heated-glassdefoggers/#on-board-diagnostic-obd-hvac-can-defrosters__read-measuring-value-block-function-08) .
- Condensation drain hose (with valve) on passenger side Checking, removing and installing. See «CONDENSATION DRAIN HOSE WITH VALVE (DRIVER/PASSENGER SIDE), CHECKING, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning) .
- Right footwell flap motor -V109-* With right footwell flap motor position sensor - G140- Removing and installing. See «TEMPERATURE REGULATOR FLAP MOTOR -V68- AND RIGHT FOOTWELL FLAP MOTOR -V109-, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning__temperature-regulator-flap-motor-v68-and) .
- Right vent temperature sensor -G151-** Removing and installing. See «LEFT VENT TEMPERATURE SENSOR -G150- AND RIGHT VENT TEMPERATURE SENSOR -G151-, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning) .
- Temperature regulator flap motor -V68-* With temperature regulator flap motor position sensor -G92- Removing and installing. See «TEMPERATURE REGULATOR FLAP MOTOR -V68- AND RIGHT FOOTWELL FLAP MOTOR -V109-, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning__temperature-regulator-flap-motor-v68-and) .
- Heater core, passenger side Removing and installing. See «PASSENGER-SIDE HEATER CORE, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning__passenger-side-heater-core-removing-and-installing) .
- Right center vent motor - V111-* With right center vent motor position sensor - G137- Removing and installing. See «LEFT CENTER VENT MOTOR -V110- AND RIGHT CENTER VENT MOTOR -V111-, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning__left-center-vent-motor-v110-and) .
- Left vent temperature sensor -G150-** Removing and installing. See «LEFT VENT TEMPERATURE SENSOR -G150- AND RIGHT VENT TEMPERATURE SENSOR -G151-, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning) .
- Defroster flap motor - V107-* With defroster flap motor position sensor -G135- Removing and installing. See «DEFROSTER FLAP MOTOR -V107-, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning__defroster-flap-motor-v107-removing-and) .
- Left center vent motor - V110-* With left center vent motor position sensor - G136- Removing and installing. See «LEFT CENTER VENT MOTOR -V110- AND RIGHT CENTER VENT MOTOR -V111-, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning__left-center-vent-motor-v110-and) .
- Interior temperature sensor fan -V42- Removing and installing. See «INTERIOR TEMPERATURE SENSOR FAN -V42-, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning) .
- Rear footwell vent motor -V112-* With rear footwell vent motor position sensor - G141- Removing and installing. See «LEFT FOOTWELL FLAP MOTOR -V108- AND REAR FOOTWELL VENT MOTOR -V112-, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning__left-footwell-flap-motor-v108-and) .
- Center vent adjusting motor -V102-* With center vent motor position sensor -G138- Removing and installing. See «CENTER VENT ADJUSTING MOTOR -V102-, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning__center-vent-adjusting-motor-v102-removing) .
- Left footwell flap motor - V108-* With left footwell flap motor position sensor - G139- Removing and installing. See «LEFT FOOTWELL FLAP MOTOR -V108- AND REAR FOOTWELL VENT MOTOR -V112-, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning__left-footwell-flap-motor-v108-and) .
- Heater core, driver side Removing and installing. See «DRIVER-SIDE HEATER CORE, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning__driver-side-heater-core-removing-and-installing) .
- Condensation drain hose (with valve) on driver side Checking, removing and installing. See «CONDENSATION DRAIN HOSE WITH VALVE (DRIVER/PASSENGER SIDE), CHECKING, REMOVING AND INSTALLING»(/audi/a8/d2-1999-2002/remont/automatic-hvac-system/#air-conditioning) .