Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI2008A3 BASE, 2.0 E, AUTOMATIC DCTREPAIR AND DIAGNOSIS (SINGLE PAGE)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSHEATING, VENTILATION80 HEATING, VENTILATIONGENERAL INFORMATIONHEATER CONTROL MODULE FUNCTIONS
2008 Audi A3 Base, 2.0 E, Automatic DCT
Heater Control Module Functions
2008 Audi A3 Base, 2.0 E, Automatic DCTSECTION Heater Control Module Functions
NOTE:
A/C system functions (A/C Control Module -J301-), refer to Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding".
- Rear Window Defogger -Z1- activation, refer to HEATED REAR WINDOW .
- Function of air recirculation button and activation of Fresh/Recirculation Air Door Motor -V154- refer to AIR RECIRCULATION BUTTON AND FRESH/RECIRCULATION AIR DOOR MOTOR CONTROL .
- Testing of seat heater (optional equipment) activation, refer to TESTING SEAT HEATER ACTIVATION .
- Activation of Engine Control Module -ECM- (in vehicles with gasoline direct fuel injection engine FSI and/or with an engine with diagram-mapped cooling, refer to TESTING ENGINE CONTROL MODULE (ECM) ACTIVATION .
- Auxiliary heater activation (vehicles without A/C), refer to TESTING AUXILIARY HEATER ACTIVATION, WITHOUT A/C .
- From MY 2010, this vehicle has a Start/Stop System for specific engines as optional equipment. The Heater Control Module -J65- has no affect on the Start/Stop function on vehicles with only a heater (no A/C). If the vehicles has a manual climate control system, then, depending on the setting on the A/C control module (for example, the heater is on) the Stop function will prevent the engine from being started again as soon as there is a request for heating. The A/C control module does not limit the Stop function when the cooling mode is on. Check using Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding".
- There is no additional coolant pump for the Start/Stop System installed on vehicles with Start/Stop System. An electric coolant pump may be present depending on the vehicle engine, which is controlled by an engine control module. Refer to [For engine(s) CBRA] AFTER-RUN COOLANT PUMP or refer to [For engine(s) BPY] AFTER-RUN COOLANT PUMP OVERVIEW or refer to [For engine(s) CCTA, CBFA] AFTER-RUN COOLANT PUMP -V51 and Vehicle Diagnosis, Testing and Information System VAS 5051 under "Guided Fault Finding".
- If the vehicle has a Start/Stop System and a manual climate control system, then install A/C control module, part number 8P0 820 047, starting with index D.
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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.