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 MANUALSAUDI1996A4 BASE, STANDARDREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)HVAC CONTROL SYSTEMSA/C-HEATER SYSTEM - AUTOMATICTESTINGTEMPERATURE SENSORS
1996 Audi A4 Base, Standard
Temperature Sensors
1996 Audi A4 Base, StandardSECTION Temperature Sensors
- Put DVOM in 20,000-ohm range. Using Adapter Cable (VAG 1598/11), use DVOM to check resistance between Test Box (VAG 1598) terminals No. 48 and 52. Measure temperature at mounting location of outside air temperature sensor. See TEMPERATURE SENSOR RESISTANCES . If resistance is not as specified, check for short, open or high resistance in Brown/Yellow wire between A/C-heater control panel and outside air temperature sensor. Check for short, open or high resistance in Brown/White wire between outside air temperature sensor and ground. Check outside air temperature sensor. Repair or replace as necessary.
- Check resistance between test box terminals No. 50 and 52. Measure temperature at mounting location of instrument panel interior temperature sensor. See TEMPERATURE SENSOR RESISTANCES . If resistance is not as specified, check for short, open or high resistance in Blue/Black wire between A/C-heater control panel and instrument panel interior temperature sensor. Check for short, open or high resistance in Brown/White wire between instrument panel interior temperature sensor and ground. Check instrument panel interior temperature sensor. Repair or replace as necessary.
- Check resistance between test box terminals No. 47 and 52. Measure temperature at mounting location of fresh air intake duct temperature sensor. See TEMPERATURE SENSOR RESISTANCES . If resistance is not as specified, check for short, open or high resistance in Brown/Green wire between A/C-heater control panel and fresh air intake duct temperature sensor. Check for short, open or high resistance in Brown/White wire between fresh air intake duct temperature sensor and ground. Check fresh air intake duct temperature sensor. Repair or replace as necessary.
TEMPERATURE SENSOR RESISTANCES
| Application & Temperature - °F (°C) | Ohms | |
|---|---|---|
| Fresh Air Intake Duct Temperature Sensor & Outside Air Temperature Sensor | ||
| 32 (0) | 3280 | |
| 41 (5) | 2540 | |
| 50 (10) | 1990 | |
| 59 (15) | 1570 | |
| 68 (20) | 1250 | |
| 77 (25) | 1000 | |
| 86 (30) | 800 | |
| 95 (35) | 650 | |
| 104 (40) | 530 | |
| 122 (50) | 360 | |
| 140 (60) | 250 | |
| Instrument Panel Interior Temperature Sensor | ||
| 32 (0) | 9400 | |
| 41 (5) | 7270 | |
| 50 (10) | 5660 | |
| 59 (15) | 4450 | |
| 68 (20) | 3500 | |
| 77 (25) | 2790 | |
| 86 (30) | 2230 | |
| 95 (35) | 1800 | |
| 104 (40) | 1450 | |
| 122 (50) | 790 | |
| 140 (60) | 670 | |
| 158 (70) | 470 | |
| 176 (80) | 330 | |
RENDER: 1.0x
NO RELATED
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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.