Heating And A/C Unit Components - Manually Regulated

Observe notes for control and regulation of components in passenger compartment. Refer to A/C SYSTEM CONTROL AND REGULATION COMPONENTS INSIDE PASSENGER COMPARTMENT .

Fig 1: Identifying Heating A/C Unit Components (Manually Regulated A/C System)

Courtesy of AUDI OF AMERICA, LLC

1. A/C Unit With Evaporator
   • Different versions of heating A/C unit in vehicles with manually and automatically regulated A/C system.
   • May only be removed when refrigerant circuit has been removed; bring vehicle to a workshop that has the necessary tools and in which the work can be performed accordingly by qualified personnel, refer to EVAPORATOR  .
   • Heating A/C unit, removing and installing, refer to HEATING AND A/C UNIT .
   • A/C unit, disassembling and assembling, refer to A/C UNIT .
   • Clean air conditioning system evaporator with Ultrasound A/C Cleaner VAS 6189A, refer to A/C EVAPORATOR CLEANING .
2. A/C System Controls / Base Plate
   • Different versions of base plate on vehicles with manually regulated A/C system and without A/C system (with heating system only).
   • Removing and installing, refer to HEATER CONTROLS .
3. A/C Control Module -J301-
   • Different versions depending on vehicle equipment (with and without Driver Heated Seat Adjuster -E94- and Front Passenger Heated Seat Adjuster -E95-).
   • Removing and installing, refer to HEATER CONTROLS .
   • Function, electrical test, refer to Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" function.
4. Heat Exchanger For Heater Unit
   • Removing and installing, refer to HEAT EXCHANGER .
5. Temperature Regulator Door Motor -V68-
   • With Temperature Regulator Door Motor Position Sensor -G92-.
   • Lever color identification: white.
   • Removing and installing, refer to LEFT TEMPERATURE / TEMPERATURE REGULATOR DOOR MOTOR .
   • The name for this control motor in Guided Fault Finding and in the wiring diagram is different on vehicles with a manually and an automatically regulated A/C system, refer to the appropriate SYSTEM WIRING DIAGRAMS information.
   • On vehicles with manually regulated A/C system, this control motor operates both temperature doors (the right and left temperature doors are connected to each other via the shaft). On vehicles with an automatically regulated A/C system, the left and right temperature doors are each actuated by one control motor.
6. Left Footwell Vent Temperature Sensor -G261-
   • This sensor is installed only at beginning of production (discontinued as running change).
   • Measured value of this sensor is not evaluated by the A/C control module, a malfunction at left footwell vent temperature sensor is not detected.
   • Removing and installing, refer to LEFT FOOTWELL VENT TEMPERATURE SENSOR .
7. Auxiliary Air Heater Heating Element -Z35- (with Auxiliary Air Heater Control Module -J604-)
   • The electric auxiliary air heater is available in different versions. On vehicles equipped with a diesel engine built through November 2006 (running change) the control of the auxiliary air heater heating element via the auxiliary air heater control module. Check using Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" function. On diesel vehicles built from November 2006 (running change) have a 3-stage Auxiliary Air Heater Heating Element which is controlled by a relay from the Engine Control Module (ECM). Check using Vehicle Diagnosis, Testing and Information System VAS 5051 in "Guided Fault Finding" function and refer to the appropriate SYSTEM WIRING DIAGRAMS information.
   • At this time, an Auxiliary Air Heater Heating Element is also installed in vehicles with Diesel engine and parking heater as optional equipment. At a later point in time (not yet finalized), the Auxiliary Air Heater Heating Element will be discontinued, then the parking heater undertakes the function of the auxiliary heater.
   • Check the function of the auxiliary air heater control module, perform Guided Fault Finding using Vehicle Diagnosis, Testing and Information System VAS 5051.
   • Removing and installing, refer to AUXILIARY HEATER HEATING ELEMENT WITH CONTROL MODULE .
8. Flexible Shaft
   • To gear mechanism with curved washer for activation of air distribution doors.
   • Removing and installing, refer to AIR DISTRIBUTION FLEXIBLE SHAFT .
9. To Gear Mechanism With Curved Washer For Activation Of Air Distribution Doors
   • Do not remove, adjustment cannot be reproduced.
10. Recirculation Door Motor -V113-
    • Different versions of recirculation door motor in vehicles with manually and automatically regulated A/C system.
    • On version for manually regulated A/C system, the recirculation door motor does not have potentiometer installed, therefore this motor is always actuated in one direction (fresh air or recirculated air mode). The direction of control motor rotation is reversed by interchanging the Plus and Minus on the outputs of A/C Control Module -J301-. The A/C control module detects via the current strength, which flows via the control motor, that is has reached its end position.
    • The recirculation door motor does not have a potentiometer, therefore a malfunction at the control motor or in its wire connection is not always detected by A/C control module.
    • Checking function using Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding".
    • Removing and installing, refer to FRESH/RECIRCULATION AIR DOOR MOTOR .
11. Intake Housing With Fresh/Recirculating Air Door
    • Different versions of the air intake shroud in vehicles with manually and automatically regulated A/C system.
    • Removing and installing, refer to AIR INTAKE HOUSING WITH FRESH/RECIRCULATING AIR DOOR .
12. Fresh Air Blower -V2-
    • Different versions of Fresh Air Blower in vehicles with manually and automatically regulated A/C system.
    • Removing and installing, refer to FRESH AIR BLOWER, MANUALLY REGULATED A/C SYSTEM .
13. Fresh Air Blower Series Resistor With Fuse -N24-
    • Removing and installing, refer to FRESH AIR BLOWER SERIES RESISTOR, MANUALLY REGULATED A/C SYSTEM .
14. Dust and Pollen Filter
    • Removing and installing, refer to DUST AND POLLEN FILTER .
    • Follow the replacement intervals, refer to Maintenance, Diagnosis .
    • As a replacement part, the dust and pollen filter is available in different versions (with and without activated charcoal element).
    • For information regarding for version with an activated charcoal insert, refer to DUST AND POLLEN FILTER WITH ACTIVATED CHARCOAL INSERT .
15. 10-pin Connector
    • To vehicle wiring harness, refer to the appropriate SYSTEM WIRING DIAGRAMS information.
16. Evaporator Vent Temperature Sensor -G263-
    • Removing and installing, refer to EVAPORATOR VENT TEMPERATURE SENSOR .
17. Coolant Pipes To Heater Core
18. Grommet
    • For sealing off opening for coolant and refrigerant lines through bulkhead to engine compartment.
    • A foam spacer bracket is installed between grommet and heating A/C unit.
    • Installing, refer to HEATING AND A/C UNIT .
19. Condensation Water Drain Connection
    • Condensation water drain valve, checking, removing and installing, refer to CONDENSATE DRAIN HOSE .
20. Expansion Valve
    • Refrigerant lines, disconnecting and reconnecting, refer to REFRIGERANT LINES, DISCONNECTING FROM EXPANSION VALVE .
    • Removing and installing, refer to EXPANSION VALVE .
      NOTE:

      After switching off the A/C compressor in this vehicle, it may take a relatively long time for the pressure on the high pressure side to decrease. This is because the expansion valve is cold and the pressure on the low pressure side increases quickly after shutting the compressor off, then the expansion valve closes and the refrigerant flows slowly to the low pressure side.