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 DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEM
1998 Audi A4 Avant Quattro, Automatic
A/C-Heater System
1998 Audi A4 Avant Quattro, AutomaticSECTION A/C-Heater System
- A/C System Specifications
- Description
- Operation
- Self-Diagnostics
- Notes
- A/C-Heater System
- RETRIEVING & CLEARING DIAGNOSTIC TROUBLE CODES (DTCs)
- A/C-Heater Control Panel Coding
- Basic Setting
- Measuring Value Block
- Output Diagnostic Test Mode
- 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 (Short Circuit To Ground)
- DTC 00797, Sunlight Photo Sensor
- 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, Outlet Temperature Center (Short Circuit To Ground Or Voltage)
- DTC 01297, Outlet Temperature Floor Outlet (Short Circuit To Ground Or Voltage)
- DTC 65535, A/C Control Head Malfunction
- Testing
- Notes
- A/C System Performance
- Test Equipment Hook-Up
- A/C-Heater Control Panel
- Temperature Sensors
- Fresh Air Blower & Fresh Air Blower Control Module
- Air/Temperature Distribution Flap Motors & Sensors
- A/C Compressor Speed Sensor, Pressure Switches & Interior Temperature Sensor Fan
- A/C Clutch Relay & Coolant Fan Low Speed
- Removal & Installation
- 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.