Manual:AUDI A3 Premium, 4D Sedan 2015Page:31750 / 92758



High Voltage Heater (PTC) -Z115-, Incorporation, In The Coolant Circuit — 2015 Audi A3 Premium, 4D Sedan Service Manual

High Voltage Heater (PTC) -Z115-, Incorporation, In The Coolant Circuit

NOTE:

The High Voltage Heater (PTC) -Z115- takes over the function of the auxiliary heater on vehicles with a high voltage system. Refer to HIGH VOLTAGE HEATER (PTC) -Z115- GENERAL INFORMATION, (AND TO THE HIGH VOLTAGE HEATER (PTC) CONTROL MODULE -J848-) .

On a vehicle with a high voltage system and a parking heater installed as optional equipment can instead of the parking heater the High Voltage Heater (PTC) -Z115- can be activated to heat the vehicle interior. Additional information. Refer to the GENERAL INFORMATION .

On vehicles with a high voltage system without a parking heater installed as optional equipment the vehicle interior can be heated at a low ambient temperature with the ignition switched off via the function "Parking heater" and the High Voltage Heater (PTC) -Z115- (or cooled via the A/C system at a high ambient temperature). Additional information. Refer to PARKING AIR CONDITIONER .

Fill The Coolant And Bleed The Coolant Circuit. Refer to COOLANT, DRAINING AND FILLING [CNSB, CNTC, CYFB] (DI - 1.8L/2.0L) / COOLANT, DRAINING AND FILLING WITHOUT COOLING SYSTEM CHARGE KIT - ELECTRIC VACUUM PUMP:VAS6096/2 (TDI - 1.6L/2.0L) .

Integration Of The A/C System Heat Exchanger And The High Voltage Heater (PTC) -Z115- In The Engine Coolant Circuit. Refer to HIGH VOLTAGE HEATER (PTC) -Z115-, INCORPORATION, IN THE COOLANT CIRCUIT , COOLING SYSTEM/COOLANT [CRUA, DEJA] / COOLANT SYSTEM/COOLANT [CNSB, CNTC] (Connection Diagram for Coolant Hoses).

NOTE:

The -arrows- show the direction of flow for the coolant.

GWWA87-11603Courtesy of AUDI OF AMERICA, LLC
  1. Heater Core for the Heater in the Air Conditioner
  2. High Voltage Heater (PTC) -Z115- (with High Voltage Heater (PTC) Control Module -J848-)
  3. Transmission Coolant Valve -N488-
  4. Coolant Supply to the Transmission
  5. Coolant Supply From Engine
  6. Coolant Return to Engine
  7. Coolant Change-Over Valve 2 -N633-
    • Incorporation of the parking heater in the engine coolant circuit. Refer to COOLING SYSTEM/COOLANT [CRUA, DEJA] / COOLANT SYSTEM/COOLANT [CNSB, CNTC] (Connection Diagram for Coolant Hoses).
    • Removing and installing. Refer to COOLANT CHANGE-OVER VALVE 2 -N633-, REMOVING AND INSTALLING  and COOLANT VALVES, REMOVING AND INSTALLING[CNSB, CNTC] / COOLANT PUMP/THERMOSTAT [CRUA, DEJA] .
      NOTE:

      The Coolant Change-Over Valve 2 -N633- is activated by the respective Engine Control Module (for example from the Engine Control Module -J623-) when the heating output of the A/C system is requested and the vehicle is in electronic drive. Refer to the appropriate Wiring Diagram(s). Use the Vehicle Diagnostic Tester in the "Guided Fault Finding " function.

      For a concern regarding insufficient heating output of the A/C system with the engine off and / or with the engine running regardless of if the High Voltage Heater (PTC) -Z115- is activated, check that it is installed on proper side and the function. Refer to the appropriate Wiring Diagram(s). Use the Vehicle Diagnostic Tester in the "Guided Fault Finding"  function.

      So that the warmed coolant from the High Voltage Heater (PTC) -Z115- through the A/C heater core is requested the High Temperature Circuit Coolant Pump -V467- and the Transmission Coolant Valve -N488- (from the respective engine control module) must be activated. So that the coolant flows in the correct direction the check valve in the coolant circuit must be installed correctly and its function must be OK. More information. Refer to COOLING SYSTEM/COOLANT [CRUA, DEJA] / COOLANT SYSTEM/COOLANT [CNSB, CNTC] (Connection Diagram for Coolant Hoses) and appropriate Wiring Diagram(s). Use the Vehicle Diagnostic Tester in the "Guided Fault Finding"  function).

  8. High Temperature Circuit Coolant Pump -V467-
    • Incorporation in the engine coolant circuit. Refer to COOLANT PUMP/COOLANT THERMOSTAT [CNSB, CNTC] / COOLANT PUMP/THERMOSTAT [CRUA, DEJA] (Connection Diagram for Coolant Hoses).
    • Removing and installing. Refer to COOLANT PUMP/COOLANT THERMOSTAT [CNSB, CNTC] / COOLANT PUMP/THERMOSTAT [CRUA, DEJA] .
      NOTE:

      The High Temperature Circuit Coolant Pump -V467- is activated by the respective engine control module (for example from the Engine Control Module -J623-) when the heating output from the A/C system is required. Refer to the appropriate Wiring Diagram(s). Use the Vehicle Diagnostic Tester in the "Guided Fault Finding"  function.

      For a concern regarding insufficient heating output of the A/C system with the engine off and/or with the engine running regardless of if the High Voltage Heater (PTC) -Z115- is activated, check that High Temperature Circuit Coolant Pump -V467- is installed on proper side and the function. Refer to the appropriate Wiring Diagram(s). Use the Vehicle Diagnostic Tester in the "Guided Fault Finding"  function.

      So that the warmed coolant from the High Voltage Heater (PTC) -Z115- through the A/C heater core is requested the Coolant Change-Over Valve 2 -N633- and the Transmission Coolant Valve -N488- (from the respective engine control module) must be activated. So that the coolant flows in the correct direction the check valve in the coolant circuit must be installed correctly and its function must be OK. More information. Refer to COOLING SYSTEM/COOLANT [CRUA, DEJA] / COOLANT SYSTEM/COOLANT [CNSB, CNTC] (Connection Diagram for Coolant Hoses) and refer to the appropriate Wiring Diagram(s). Use the Vehicle Diagnostic Tester in the "Guided Fault Finding"  function).

  9. Coolant Return from the Transmission