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 SYSTEMSELF-DIAGNOSTICSMEASURING VALUE BLOCK
1998 Audi A4 Avant Quattro, Automatic
Measuring Value Block
1998 Audi A4 Avant Quattro, AutomaticSECTION Measuring Value Block
- Check Diagnostic Trouble Code (DTC) memory. See procedures in RETRIEVING & CLEARING DIAGNOSTIC TROUBLE CODES (DTCs). Repair A/C system malfunctions (if any). After checking DTC memory, keep engine running and turn A/C system to AUTO mode. Run fan at high speed for about one minute.
- Ensure scan tester is in A/C/HEATING ELECTRONICS function. With RAPID DATA TRANSFER displayed on scan tester, press "0" and "8" buttons to select READ MEASURING VALUE BLOCK function. Press "Q" button to enter input.
- With ENTER DISPLAY GROUP NUMBER displayed on scan tester, enter desired display group number. See DISPLAY GROUP NUMBER IDENTIFICATION. Press "Q" button to enter input.
- With READ MEASURING VALUE BLOCK X displayed on scan tester, check component function, measured value or operating conditions using display field reference. See DISPLAY GROUP NUMBER IDENTIFICATION. To select a different display group number, press "C" button. Press right arrow button to end procedure.
DISPLAY GROUP NUMBER IDENTIFICATION
| Display Group No. | Display Field | Application |
|---|---|---|
| 01 | 1 | A/C Compressor Switch-Off Conditions |
| 01 | 2 | Not Used |
| 01 | 3 | A/C-Heater Control Panel Voltage |
| 01 | 4 | Ignition Off Standing Time In Minutes |
| 02 | 1-4 | Temperature Regulator Flap Motor |
| 03 | 1-4 | Central Flap Motor |
| 04 | 1-4 | Footwell/Defroster Flap Motor |
| 05 | 1-4 | Airflow Flap Motor |
| 06 | 1 | Calculated Ambient Temperature For Outside Air Temperature Display |
| 06 | 2 | Fresh Air Intake Duct Temperature Sensor |
| 06 | 3 | Outside Air Temperature Sensor |
| 06 | 4 | Not Used |
| 07 | 1 | Center Outlet Temperature Sensor |
| 07 | 2 | Floor Outlet Temperature Sensor |
| 07 | 3 | Instrument Panel Interior Temperature Sensor |
| 07 | 4 | Coolant Temperature |
| 08 | 1 | Fresh Air Blower Specified Voltage |
| 08 | 2 | Fresh Air Blower Actual Voltage |
| 08 | 3 | Instrument Panel Dimmer Switch Voltage |
| 08 | 4 | Not Used |
| 09 | 1 | Engine Speed |
| 09 | 2 | Vehicle Speed |
| 09 | 3 | Auxiliary Heater |
| 09 | 4 | Not Assigned |
| 10 | 1 | Coolant Temperature Switch |
| 10 | 2 | A/C Compressor Intervention |
| 10 | 3 | A/C Pressure Switch |
| 10 | 4 | Not Assigned |
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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.