Error Code 03 (In-Car Temperature Sensor)
WARNING: This page is about a different car, the 1994 Mercury Sable, 1994 Lincoln Continental, and 1994 Ford Taurus. However, it is still accessible from the selected car via links, so may be relevant.
- Symptoms associated with Code 03 are cold air discharged when heat is selected and warm air discharged when A/C is selected. Unplug in-car temperature sensor. Measure resistance across sensor terminals. See IN-CAR & AMBIENT TEMPERATURE SENSOR RESISTANCE table.
- If sensor resistance is not as specified, replace sensor. If sensor resistance is okay, disconnect negative battery cable. Check wiring and connectors between sensor and EATC control panel for shorted or open circuits. Repair as necessary.
IN-CAR & AMBIENT TEMPERATURE SENSOR RESISTANCE
| Temperature °F (°C) | Ohms |
|---|---|
| 50-68 (10-20) | 37,000-58,000 |
| 68-86 (20-30) | 24,000-37,000 |
| 86-104 (30-40) | 16,000-24,000 |