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 MANUALSAUDI1998A4 AVANT QUATTRO, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)EXTERNAL PAGESDIFFERENT CARSECTION 16 (AUTOMATIC A/C-HEATER SYSTEMS)
1998 Audi A4 Avant Quattro, Automatic
Section 16 (Automatic A/C-Heater Systems)
1998 Audi A4 Avant Quattro, AutomaticSECTION Section 16 (Automatic A/C-Heater Systems)
WARNING: This page is about a different car, the 2001 Audi S4, 2001 Audi A4, 2000 Audi S4, and 2000 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
- Specifications
- Description
- Operation
- Programming
- Self-Diagnostics
- Diagnostic Tests
- DTC 00000: No DTC Recognized
- DTC 00532: Supply Voltage Too Low
- DTC 00600: Temperature Regulator Flap Motor Position Sensor
- DTC 00601: Central Flap Motor Position Sensor
- DTC 00602: FOOTWELL/Defroster Motor Position Sensor
- DTC 00603: FOOTWELL/Defroster Flap Motor
- DTC 00604: Back Pressure Flap Motor Position Sensor
- DTC 00625: Road Speed Signal
- DTC 00779: Outside Air Temperature Sensor
- DTC 00785: Instrument Panel Interior Temperature Sensor
- DTC 00787: Fresh Air Intake Duct Temperature Sensor
- DTC 00792: A/C Pressure Switch
- DTC 00796: Interior Temperature Sensor Fan
- DTC 00797: Sunlight Photo Sensor
- DTC 01044: A/C-Heater Control Panel Incorrectly Coded
- DTC 01087: Basic Setting Not Performed
- DTC 01206: Signal For Time Span Ignition Off (Incorrect Signal)
- DTC 01271: Temperature Regulator Flap Motor
- DTC 01272: Central Air Flap Motor
- DTC 01273: Fresh Air Blower
- DTC 01274: Airflow Flap Motor
- DTC 01296: Center Outlet Temperature Sensor
- DTC 01297: Floor Outlet Temperature Sensor
- DTC 01582: Coolant Temperature Signal
- DTC 65535: A/C Control Head Malfunction
- System Tests
- Notes
- A/C System Performance
- A/C Pressure Switch
- A/C-Heater Control Panel
- Temperature Sensors
- Fresh Air Blower & Fresh Air Blower Control Module
- Air/Temperature Distribution Flap Motors & Sensors
- A/C Pressure Switch, A/C Compressor Signal, Engine Temperature Signal & Interior Temperature Sensor Fan
- A/C Clutch Relay & Coolant Fan Low Speed
- Removal & Installation
- Notes
- A/C Compressor
- A/C-Heater Assembly
- A/C-Heater Control Panel
- Accumulator
- Air/Temperature Distribution Flap Motors
- Center Console
- Center Outlet & Floor Outlet Temperature Sensors
- Dust/Pollen Filter
- Evaporator
- Fresh Air Blower
- Fresh Air Blower Control Module
- Fresh Air Intake Duct Temp. Sensor
- Heater Core
- Orifice Tube
- Torque Specifications
- Wiring Diagrams
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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.