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HOMESERVICE MANUALSAUDI2008A3 BASE, 2.0 E, AUTOMATIC DCTREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSAIR CONDITIONING87 AIR CONDITIONINGREMOVAL AND INSTALLATIONAUXILIARY HEATER HEATING ELEMENT WITH CONTROL MODULE
2008 Audi A3 Base, 2.0 E, Automatic DCT

Auxiliary Heater Heating Element With Control Module

2008 Audi A3 Base, 2.0 E, Automatic DCTSECTION Auxiliary Heater Heating Element With Control Module
NOTE:
  • An electric auxiliary air heater is currently installed in vehicles with diesel engine. In this system, the air is supplied with heat energy after it has left the heater core of the heater / A/C unit, in the event a request from the Climatronic Control Module -J255- / or from the A/C Control Module -J301- is present. The electric auxiliary air heater is controlled by the Auxiliary Air Heater Control Module -J604- or by the engine control module (on the 3-stage version by the Low Heat Output Relay -J359- and the High Heat Output Relay -J360-). Check using Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding" (Guided Fault Finding for each engine control module) and refer to the appropriate SYSTEM WIRING DIAGRAMS information.
  • 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 Heater Heating Element -Z35- is via the Auxiliary Air Heater Control Module -J604-. Check using Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding". On vehicles with Diesel engine manufactured later than November 2006 (running change in production), a 3-stage auxiliary heater heating element is installed, which is actuated via a relay by the respective Engine Control Module (ECM). Refer to the appropriate SYSTEM WIRING DIAGRAMS information.
  • At this time, an auxiliary 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 heater heating element will be discontinued, then the parking heater undertakes the function of the auxiliary heater.
  • Functional testing of the electric auxiliary air heater activation on a vehicle with a auxiliary air heater control module is described in Guided Fault Finding of the A/C system using Vehicle Diagnosis, Testing and Information System VAS5051.
  • Measuring value block of auxiliary air heater control module indicates that auxiliary heater is switched on or why no activation is occurring despite a request using Vehicle Diagnosis, Testing and Information System VAS 5051.
  • Functional testing of the electric auxiliary air heater activation on a vehicle with a 3-stage auxiliary heater heating element is described in Guided Fault Finding of the respective Engine Control Module (ECM) using Vehicle Diagnosis, Testing and Information System VAS 5051.
  • At this time, no auxiliary heater is installed in vehicles with gasoline engine, also the parking heater is not activated as auxiliary heater.
  • Only air distribution housings with an opening for an auxiliary heating element are available as replacement parts. In vehicles without auxiliary heater heating element, the opening is sealed by cover for heater core (different versions).

Removing 

-- Remove driver side storage compartment. Refer to Removal and Installation .

-- Remove center console. Refer to Removal and Installation .

-- Remove left footwell vent -A- (driver side). Refer to Removal and Installation .

Fig 1: Identifying Footwell Vent, Connector, And Sensor
GWWA87-0684Courtesy of AUDI OF AMERICA, LLC

-- Remove the bracket -B-. Refer to Removal and Installation .

-- Remove 4 bolts -A- and remove cover -B-.

Fig 2: Identifying Bolts And Cover
GWWA87-0685Courtesy of AUDI OF AMERICA, LLC
RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.