THERMO Time Switch
Remove electrical connector from switch. Measure resistance as indicated in resistance table. If any resistance value is not to specification, replace switch.
THERMO TIME SWITCH RESISTANCE
| Temperature: °F (°C) | Terminals | Ohms |
|---|---|---|
| Below 86 (30) | G & Ground | 25-40 |
| Below 86 (30) | W & Ground | 0 |
| Below 86 (30) | G & W | 25-40 |
| Above 104 (40) | G & Ground | 50-80 |
| Above 104 (40) | W & Ground | 100-160 |
| Above 104 (40) | G & W | 50-80 |
- Warm engine to normal operating temperature and stop engine. Using a thermometer, measure temperature of coolant. Disconnect negative battery cable and sensor electrical connector.
- Connect ohmmeter leads to both terminals of sensor. Readings should be as specified for corresponding temperatures. See COOLANT TEMPERATURE SENSOR RESISTANCE table. If not, replace coolant temperature sensor.
COOLANT TEMPERATURE SENSOR RESISTANCE
| Temperature °F (°C) | Resistance (Ohms) |
|---|---|
| 68 (20) | 2100-2900 |
| 122 (50) | 700-1000 |
| 176 (80) | 250-400 |