Incorporation Of Rear HVAC System Into Cooling And Refrigerant Circuit

NOTE:

The rear A/C system is installed only in vehicles with "Comfort" version A/C system as optional equipment.

Fig 1: Incorporation Of Rear HVAC System Into Cooling And Refrigerant Circuit

Courtesy of AUDI OF AMERICA, LLC

Low Pressure Side Connection To Evaporator In Rear Heating & A/C Unit
- Refrigerant line, disconnecting and reconnecting, refer to REFRIGERANT LINE CONNECTION POINTS, LOOSENING AND ASSEMBLING .
High Pressure Side Connection To Evaporator In Rear Heating & A/C Unit
- Refrigerant line, disconnecting and reconnecting, refer to REFRIGERANT LINE CONNECTION POINTS, LOOSENING AND ASSEMBLING .
Coolant Supply From Engine
- On vehicles with a 6-cylinder TDI engine and all vehicles with parking/auxiliary heater to the Coolant Recirculation Pump -V50-. Refer to INCORPORATION OF THE A/C SYSTEM IN VEHICLE COOLANT CIRCUIT .
- To heater cores of front and rear heating & A/C units. Refer to INCORPORATION OF FRONT HVAC SYSTEM INTO COOLING CIRCUIT on vehicles with 6 cylinder gasoline engine.
- Incorporation of A/C system into cooling circuit, refer to INCORPORATION OF FRONT HVAC SYSTEM INTO COOLING CIRCUIT .
- Incorporation of A/C system into engine cooling circuit, refer to [For engine(s) BAR] Description and Operation .
  NOTE:
  From MY 2014, a Coolant Shut-Off Valve -N82- is installed on certain engines without the optional "parking heater".
  
  The coolant shut-off valve -N82- is activated by the Climatronic Control Module -J255- front A/C control head (via the Engine Coolant Shut-Off Valve Relay -J541-), when no heat is desired in the passenger compartment. Refer to Wiring diagrams, Troubleshooting & Component locations and the Vehicle Diagnostic Tester in "Guided Fault Finding" .
  
  The Heater Coolant Shut-Off Valve -N82- is activated by the Auxiliary Heater Control Module -N279- when requested by the climatronic control module -J255- on vehicles with the optional "parking heater" and a motor on which a coolant shut-off valve -J255- would be activated (observe the parking heater adaption). Refer to Wiring diagrams, Troubleshooting & Component locations and the Vehicle Diagnostic Tester in "Guided Fault Finding" .
Coolant Supply To Heater Core In Rear Heating & A/C Unit
- Incorporation of A/C system into cooling circuit, refer to INCORPORATION OF FRONT HVAC SYSTEM INTO COOLING CIRCUIT .
Coolant Return From The Heater Core The Rear A/C Unit
- Incorporation of A/C system into cooling circuit, refer to INCORPORATION OF FRONT HVAC SYSTEM INTO COOLING CIRCUIT .
Coolant Return To Engine
- Incorporation of A/C system into cooling circuit, refer to INCORPORATION OF FRONT HVAC SYSTEM INTO COOLING CIRCUIT .
- Incorporation of A/C system into engine cooling circuit, refer to[For engine(s) BAR] Description and Operation .
Bracket For Coolant and Refrigerant Lines
Connection Points In Refrigerant Lines
- Loosening and assembling connection points of refrigerant lines, refer to REFRIGERANT LINE CONNECTION POINTS, LOOSENING AND ASSEMBLING .
Pass-Through For Coolant Hoses and Refrigerant Lines
- Removing and installing, refer to PASS-THROUGH FOR COOLANT HOSES AND REFRIGERANT LINES TO REAR WHEEL HOUSING .
- Check that coolant hoses are installed correctly.
- Refrigerant line, disconnecting and reconnecting, refer to PASS-THROUGH FOR COOLANT HOSES AND REFRIGERANT LINES TO REAR WHEEL HOUSING .