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)HEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEMSELF-DIAGNOSTICSBASIC SETTING
1998 Audi A4 Avant Quattro, Automatic
Basic Setting
1998 Audi A4 Avant Quattro, AutomaticSECTION Basic Setting
- Check Diagnostic Trouble Code (DTC) memory. See procedures in RETRIEVING & CLEARING DIAGNOSTIC TROUBLE CODES (DTCs). Repair A/C system malfunctions (if any). Erase DTC memory, and check coding of A/C-heater control panel. See A/C-HEATER CONTROL PANEL CODING .
- Ensure scan tester is in A/C/HEATING ELECTRONICS function. With RAPID DATA TRANSFER displayed on scan tester, press "0" and "4" buttons to select START BASIC SETTING function. Press "Q" button to enter input.
- With ENTER DISPLAY NUMBER XX displayed on scan tester, press "0" and "4" buttons. Press "Q" button to enter input. Flap motors will then be actuated in the following sequence: temperature regulator flap motor, central flap motor, footwell/defroster flap motor, and air-flow flap motor. End positions are determined from resistance values of potentiometers installed in flap motors. When all readout fields on scan tester indicate "0", basic setting is complete. Press right arrow button to end procedure.
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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.