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Engine Coolant Temperature Gauge Always Hot

  1. If diagnostic system check has been performed, go to next step. If diagnostic system check has not been performed, perform INSTRUMENT CLUSTER DIAGNOSTIC SYSTEM CHECK  under SELF-DIAGNOSTIC SYSTEM.
  2. Start engine and observe engine coolant temperature gauge. If engine coolant temperature gauge indicates hot when engine is cold, go to next step. If engine coolant temperature gauge does not indicate hot when engine is cold, problem may be intermittent. Try to recreate fault by wiggling wiring and connectors. Check for faulty connections at all connectors that may be causing intermittent condition. See WIRING DIAGRAMS  .
  3. Connect scan tool to Data Link Connector (DLC). Using scan tool, perform engine coolant temperature gauge sweep test. If engine coolant temperature gauge does not sweep from cold, to hot and then return to cold, go to next step. If engine coolant temperature gauge sweeps from cold, to hot and then returns to cold, perform on-board diagnostic system check. See ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK under SELF-DIAGNOSTIC SYSTEM in appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  4. Replace instrument cluster. See INSTRUMENT CLUSTER  under REMOVAL & INSTALLATION. Check system operation.
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