Heating And A/C System In Coolant Circuit, Incorporating, Vehicles Without Parking And Auxiliary Heater

• The arrows show the coolant flow direction.

Courtesy of AUDI OF AMERICA, LLC

1. Coolant Return to Engine
   • Heating and A/C system integration into the engine coolant circuit. Refer to CONNECTION DIAGRAM - COOLANT HOSES .
2. Coolant Circuit Connection
   • Depending on vehicle equipment, only present on specific engines. Refer to CONNECTION DIAGRAM - COOLANT HOSES .
   • Component locations depending on the engine. Refer to CONNECTION DIAGRAM - COOLANT HOSES .
   • Depending on the engine, a check valve may also be installed in this connection. Pay attention to this check valve (installed on the correct side and function) if there is a complaint of noises coming from the coolant circuit. Refer to CONNECTION DIAGRAM - COOLANT HOSES .
3. Coolant Shut-Off Valve -N82-
   • The Coolant Shut-Off Valve -N82- is currently only installed in vehicles with certain engines (for example, currently not installed on vehicles with a 1.8L and 2.0L TFSI engine). Refer to CONNECTION DIAGRAM - COOLANT HOSES ).
   • Removing and Installing. Refer to Coolant Shut-Off Valve -N82-, REMOVING AND INSTALLING .
   • Installed depending on vehicle equipment. Refer to the Parts Information.
   • On vehicles with a parking heater a Heater Coolant Shut-Off Valve -N279- is installed. Refer to INCORPORATION OF HEATING AND A/C SYSTEM INTO COOLANT CIRCUIT, VEHICLES WITH A PARKING HEATER , the Parts Information and the appropriate service information. .
4. Heater and A/C Unit
   • Heat exchanger, removing and Installing with the heater and A/C unit installed. Refer to HEATER CORE, REMOVING AND INSTALLING .
   • Heat exchanger, removing and Installing with the heater and A/C unit removed. Refer to OVERVIEW - HEATER AND A/C UNIT .
5. Coolant Supply from Engine
   • Heating and A/C system integration into the engine coolant circuit. Refer to CONNECTION DIAGRAM - COOLANT HOSES .
6. Coolant Recirculation Pump -V50-
   • Installed depending on vehicle equipment. Refer to the Parts Information.
   • Removing and installing. Refer to ELECTRIC COOLANT PUMP, REMOVING AND INSTALLING .
7. Check Valve
   • Installed depending on vehicle equipment. Refer to the Parts Information.
   • Function, checking, removing and installing. Refer to CONNECTION DIAGRAM - COOLANT HOSES .
8. Coolant Circuit Connection
   • Installed depending on vehicle equipment. Refer to the Parts Information.
   • Incorporation depending on the engine (for example to the coolant expansion tank). Refer to CONNECTION DIAGRAM - COOLANT HOSES .
9. Coolant Circuit Connection
   • Installed depending on vehicle equipment. Refer to the Parts Information.
   • Incorporation depending on the engine (for example to the coolant expansion tank). Refer to CONNECTION DIAGRAM - COOLANT HOSES .