Temperature Sending Unit Test
Disconnect Yellow/Green wire from coolant temperature sending unit. With engine cold, measure resistance between sending unit terminal and ground. Warm engine and measure change in sending unit resistance. See COOLANT TEMPERATURE SENDING UNIT RESISTANCE table.
COOLANT TEMPERATURE SENDING UNIT RESISTANCE
| Application | Ohms |
|---|---|
| Temperature at 133°F (56°C) | 142 |
| Temperature at 185-212°F (85-100°C) | 32-49 |