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Home >> GMC >> 1993 >> C3500 HD 6.5 F, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Testing >> Coolant Temperature Gauge >> Gauge Indicates Cold When Engine Is Hot

Gauge Indicates Cold When Engine Is Hot

  1. Check for blown GAGES fuse. Unplug connector from coolant temperature sending unit. Turn ignition on. Connect sending unit lead to ground. If gauge indicates HOT, go to next step. If gauge does not indicate HOT, check for open in sending unit lead. If sending unit lead is okay, replace cluster.
  2. Reconnect sending unit. If gauge now indicates COLD, inspect sending unit connection. If connection is okay, replace sending unit. After replacing sending unit, if gauge still indicates COLD with hot engine, gauge is defective. Replace cluster.
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