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Test E: Temperature Warning Light Flickers & Gauge Reads Fully Hot

NOTE: Ensure engine coolant level is full and temperature sending unit connector is securely attached.
  1. Turn switch to RUN position. Wiggle Red/White and Yellow/Red wires at temperature sending unit harness connector. If temperature gauge and light remains steady, go to next step. If gauge fluctuates or light flickers, repair open in temperature sending unit wire. See WIRING DIAGRAMS .
  2. Turn ignition switch to LOCK position. Disconnect temperature sending unit. Connect a 10-amp fused jumper wire between temperature sending unit harness connector terminals. Turn ignition switch to RUN position. Temperature gauge should indicate fully HOT with jumper wire installed and fully COLD with jumper wire removed. If gauge indicates as specified, replace temperature sending unit. If gauge does not indicate as specified, go to TEST D: TEMPERATURE GAUGE INACCURATE  test.
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