LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2000 >> Savana G2500, Van Cargo Extended, 5.0 M >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Analog Instrument Panels >> System Tests >> Engine Coolant Temperature Gauge Is Inaccurate

Engine Coolant Temperature Gauge Is Inaccurate

  1. Warm engine to normal operating temperature. Compare actual engine temperature with engine coolant temperature gauge reading. If readings are within 30°F of each other, engine coolant temperature gauge is operating properly. Check cooling system. If readings are not within 30°F of each other, go to next step.
  2. Disconnect Engine Coolant Temperature (ECT) gauge sender harness connector. Using Tester (J-33431-B), connect Red tester lead to Dark Green wire terminal of ECT gauge sensor (component side) connector and Black lead to ground. Adjust tester to 1305 ohms and observe engine coolant temperature gauge. Adjust tester to 49.5 ohms and observe engine coolant temperature gauge. If engine coolant temperature gauge indicates approximately 100°F, then approximately 260°F, replace ECT gauge sensor. If engine coolant temperature gauge does not indicate approximately 100°F, then approximately 260°F, go to next step.
  3. If engine coolant temperature gauge indicated significantly below hot at 49.5 ohms in previous step, go to next step. If engine coolant temperature gauge did not indicate significantly below hot at 49.5 ohms, replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION.
  4. Disconnect instrument cluster harness connector. Using ohmmeter, measure resistance between instrument panel harness connector terminal B9 (Dark Green wire) and ECT gauge sensor harness connector. If resistance is less than 20 ohms, replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. If resistance is more than 20 ohms, repair Dark Green wire as necessary.
scientia non olet · About LEMON Manuals