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HOMESERVICE MANUALSCHEVROLET1997FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSIS (SINGLE PAGE)ELECTRICALGAUGESINSTRUMENT PANEL (P SERIES)SYSTEM TESTSTEMPERATURE GAUGE IS INACCURATE (COMMERCIAL)
1997 Chevrolet Forward Control 5.7 R, Automatic

Temperature Gauge Is Inaccurate (Commercial)

1997 Chevrolet Forward Control 5.7 R, AutomaticSECTION Temperature Gauge Is Inaccurate (Commercial)
  1. Turn ignition switch to RUN position. Disconnect temperature sender harness connector. Using Tester (J-33431-B), connect Red tester lead to Dark Green wire terminal of temperature sender connector, and other lead to ground. Set dial to 1400 ohms. Slowly rotate dial to 50 ohms. If temperature gauge does not respond, go to next step. If gauge reads COLD at 1400 ohms, and HOT at 50 ohms, replace coolant temperature sender.
  2. Disconnect instrument cluster harness connector. Measure resistance between harness connector terminal No. 22 (Dark Green wire) and ground. If resistance is less than 5 ohms, replace instrument cluster. If resistance is more than 5 ohms, repair Dark Green wire.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.