Engine Coolant Temperature Gauge

1. Disconnect water temperature indicator sender unit C1061. Connect one lead of the Instrument Gauge System Tester to water temperature indicator sender unit C170, circuit 39 (RD/WH), and the other lead to ground.







2. Set the Instrument Gauge System Tester to 300 ohms. Key ON. Wait one minute. The engine coolant temperature gauge should indicate C (cold). Key OFF.







3. Set the Instrument Gauge System Tester to 45 ohms. Key ON. Wait one minute. The engine coolant temperature gauge pointer should be in the one-quarter range to mid-range. Key OFF.







4. Set the Instrument Gauge System Tester to 18 ohms. Key ON. Wait one minute. The engine coolant temperature gauge should indicate H (hot). Key OFF. Return to the Pinpoint Test. Pinpoint Tests - Instrument Cluster