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Home >> GMC >> 1992 >> C3500 HD 6.5 F, Standard >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Testing & Diagnosis >> Coolant Temperature Gauge >> Gauge Reads Cold When Engine Is Hot

Gauge Reads Cold When Engine Is Hot

  1. Check for blown GAGES fuse. If fuse is okay, disconnect lead connector from coolant temperature sending unit, and turn ignition on. Turn ignition on. Connect sending unit lead to ground. Gauge should read 260°F.
  2. If gauge reads 260°F, go to next step. If gauge does not read 260°F, check for open in sending unit lead circuit. If sending unit lead circuit is okay, replace gauge.
  3. Reconnect connector to sending unit. If gauge now reads 100°F, ensure sending unit connection is correct. If connection is okay, replace sending unit. After replacing sending unit, if gauge still reads near 100°F with hot engine, gauge is also damaged. Replace gauge.
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