Automatic Climate Control components in passenger compartment, servicing: Notes

• 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 .
• A/C system servicing: See A/C 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) .
• An electrical test is possible at all the components identified with two asterisks (**). See AUTOMATIC CLIMATE CONTROL SYSTEM, ELECTRICAL .
• 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 .

1. 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) .
2. A/C control head -E87- 
   • Allocation. See A/C CONTROL HEAD -E87-, REMOVING AND INSTALLING .
   • Removing and installing. See A/C CONTROL HEAD -E87-, REMOVING AND INSTALLING .
   • Replacing bulbs of A/C control head panel. See A/C CONTROL HEAD -E87-, REPLACING BULBS .
   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 .
   • 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 .
3. Instrument panel interior temperature sensor -G56-** 
   • Removing and installing. See INSTRUMENT PANEL INTERIOR TEMPERATURE SENSOR -G56-, REMOVING AND INSTALLING .
4. Data Link Connector (DLC) 
   • Connecting VAG 1551 and testing A/C system. See VAG 1551 ((VAG 1552) SCAN TOOL (ST), CONNECTING AND SELECTING FUNCTIONS .
5. 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 .
6. 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 .
7. 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 .
8. Right center vent switch -F184-** 
   • Removing and installing air outlet. See CENTER AIR OUTLET IN INSTRUMENT PANEL, REMOVING AND INSTALLING .
9. Center vent position sensor -G142-** 
   • Removing and installing air outlet. See CENTER AIR OUTLET IN INSTRUMENT PANEL, REMOVING AND INSTALLING .
10. Sunlight photo sensor - G107-** 
    • Removing and installing. See SUNLIGHT PHOTO SENSOR -G107-, REMOVING AND INSTALLING .
11. Left center vent switch - F183-** 
    • Removing and installing air outlet. See CENTER AIR OUTLET IN INSTRUMENT PANEL, REMOVING AND INSTALLING .
12. 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) .
13. 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 .
14. 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 .
15. Right vent temperature sensor -G151-** 
    • Removing and installing. See LEFT VENT TEMPERATURE SENSOR -G150- AND RIGHT VENT TEMPERATURE SENSOR -G151-, REMOVING AND INSTALLING .
16. 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 .
17. Heater core, passenger side 
    • Removing and installing. See PASSENGER-SIDE HEATER CORE, REMOVING AND INSTALLING .
18. 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 .
19. Left vent temperature sensor -G150-** 
    • Removing and installing. See LEFT VENT TEMPERATURE SENSOR -G150- AND RIGHT VENT TEMPERATURE SENSOR -G151-, REMOVING AND INSTALLING .
20. Defroster flap motor - V107-* 
    • With defroster flap motor position sensor -G135-
    • Removing and installing. See DEFROSTER FLAP MOTOR -V107-, REMOVING AND INSTALLING .
21. 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 .
22. Interior temperature sensor fan -V42- 
    • Removing and installing. See INTERIOR TEMPERATURE SENSOR FAN -V42-, REMOVING AND INSTALLING .
23. 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 .
24. Center vent adjusting motor -V102-* 
    • With center vent motor position sensor -G138-
    • Removing and installing. See CENTER VENT ADJUSTING MOTOR -V102-, REMOVING AND INSTALLING .
25. 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 .
26. Heater core, driver side 
    • Removing and installing. See DRIVER-SIDE HEATER CORE, REMOVING AND INSTALLING .
27. 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 .