Coolant Temperature Sending Unit Test
NOTE:
On Esteem, coolant temperature sensor has 3 terminals. When performing resistance test, measure resistance at center terminal.
Partially drain cooling system. Disconnect coolant temperature sending unit harness connector. Remove sending unit from vehicle. Warm sending unit in water. Ensure resistance decreases with increase of temperature. See Fig 1 . Check sending unit resistance as temperature changes. See COOLANT TEMPERATURE SENDING UNIT RESISTANCE table. If resistance is not as specified, replace coolant temperature sending unit.
COOLANT TEMPERATURE SENDING UNIT RESISTANCE
| Water Temperature °F (°C) | Ohms |
|---|---|
| 122 | 190-260 |
| 176 | 55-65 |
| 212 | 25-35 |