Overview - Heater And A/C Unit, Heater Core, Auxiliary Heater Heating Element

Fig 1: Exploded View Of Heater & A/C Unit, Heater Core, Auxiliary Heater Heating Element

Courtesy of AUDI OF AMERICA, LLC

Bolt
- 2 Nm
Coolant Pipe for the Heater Core
- There are different versions. Refer to the Parts Information.
- Coolant supply from engine
- Removing and installing. Refer to HEATER CORE, REMOVING AND INSTALLING .
Clamp
- Can be replaced with a spring-type clamp when servicing.
Coolant Pipe for the Heater Core
- There are different versions. Refer to the Parts Information.
- Coolant return to engine
- Removing and installing. Refer to HEATER CORE, REMOVING AND INSTALLING .
O-Ring Seal
- Always replace. Refer to HEATER CORE, REMOVING AND INSTALLING .
- There are different versions. Refer to the Parts Information.
Cover
- For the heater core
Bolt
- 2 Nm
Foam Spacer
- For sealing/insulating
- Observe installed position
Bracket
- For the coolant pipes
Foam Piece
- For insulating
- Observe installed position
Heater and A/C Unit
- On vehicles without an Auxiliary Heater Heating Element -Z35-, the opening for the auxiliary heater is sealed.
- Removing and installing. Refer to HEATER AND A/C UNIT, REMOVING AND INSTALLING .
- Disassembling and assembling. Refer to HEATER AND A/C UNIT, DISASSEMBLING AND ASSEMBLING .
Heat Exchanger
- There are different versions. Refer to the Parts Information.
- Removing and installing. Refer to HEATER CORE, REMOVING AND INSTALLING .
Auxiliary Heater Heating Element -Z35-
- Activation, checking. Refer to AUXILIARY HEATER ACTIVATION, CHECKING (THE Auxiliary Heater Heating Element -Z35-) .
- Removing and installing. Refer to Auxiliary Heater Heating Element -Z35-, REMOVING AND INSTALLING .
  NOTE:
  At his time on vehicles with a high voltage system the Auxiliary Heater Heating Element -Z35- is not installed, on these vehicles the High Voltage Heater (PTC) -Z115- (with High Voltage Heater (PTC) Control Module -J848-) performs this function. Refer to High Voltage Heater (PTC) -Z115- GENERAL INFORMATION, (AND TO THE High Voltage Heater (PTC) Control Module -J848-) .
Bolt
- 2 Nm
- Quantity: 2
Wire
- For Auxiliary Heater Heating Element -Z35-
- Removing and installing. Refer to Auxiliary Heater Heating Element -Z35-, REMOVING AND INSTALLING .
Ground Cable
- Nut - 9 Nm
- For the auxiliary heater
Bolt
- 2 Nm
- Quantity: 3
Screw Clamp
O-Ring Seal
- There are different versions. Refer to the Parts Information.
- Replace. Refer to HEATER CORE, REMOVING AND INSTALLING .

Fig 1: Exploded View Of Heater & A/C Unit, Heater Core, "Denso" Auxiliary Heater Heating Element

Courtesy of AUDI OF AMERICA, LLC

Heat Exchanger
- There are different versions. Refer to the Parts Information
- Removing and installing. Refer to HEATER CORE, REMOVING AND INSTALLING .
Bracket
Bolt
- 2 Nm
O-Ring Seal
- Always replace. Refer to HEATER CORE, REMOVING AND INSTALLING .
- There are different versions. Refer to the Parts Information
Screw Clamp
- Bolt tightening specification 2 Nm
Coolant Pipe for the Heater Core
- There are different versions. Refer to the Parts Information
- Coolant supply from engine
- Removing and installing. Refer to HEATER CORE, REMOVING AND INSTALLING .
Screw Clamp
- Bolt tightening specification 2 Nm
O-Ring Seal
- Always replace. Refer to HEATER CORE, REMOVING AND INSTALLING .
- There are different versions. Refer to the Parts Information
Coolant Pipe for the Heater Core
- There are different versions. Refer to the Parts Information
- Coolant return to engine
- Removing and installing. Refer to HEATER CORE, REMOVING AND INSTALLING .
Bolt
- 2 Nm
Foam Spacer
- For sealing/insulating
- Observe installed position
Bracket
- For the coolant pipes
Foam Piece
- For insulating
- Observe installed position
Heater and A/C Unit
- On vehicles without an Auxiliary Heater Heating Element -Z35-, the opening for the auxiliary heater is sealed.
- Removing and installing. Refer to HEATER AND A/C UNIT, REMOVING AND INSTALLING .
- Disassembling and assembling. Refer to HEATER AND A/C UNIT, DISASSEMBLING AND ASSEMBLING .
Auxiliary Heater Heating Element -Z35-
- Activation, checking. Refer to AUXILIARY HEATER ACTIVATION, CHECKING (THE Auxiliary Heater Heating Element -Z35-) .
- Removing and installing. Refer to Auxiliary Heater Heating Element -Z35-, REMOVING AND INSTALLING .
Bolt
- 2 Nm
- Quantity: 2
Wire
- For Auxiliary Heater Heating Element -Z35-
- Removing and installing. Refer to Auxiliary Heater Heating Element -Z35-, REMOVING AND INSTALLING .
Ground Cable
- Nut - 9 Nm
- For the auxiliary heater