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Home >> Oldsmobile >> 2001 >> Intrigue GL >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1258: Engine Coolant OVERTEMPERATURE - Protection Mode Active >> Diagnostic Procedures

Diagnostic Procedures

  1. If engine cooling diagnostic system check has already been performed, go to next step. If engine cooling diagnostic system check has not been perform, go to ENGINE COOLING DIAGNOSTIC SYSTEM CHECK  under DIAGNOSTIC SYSTEM CHECKS.
  2. Check cooling fan operation. If cooling fans are not functioning properly, diagnose cooling fans as necessary. See ELECTRIC COOLING FANS - CARS article in ENGINE COOLING. If cooling fans are functioning properly, diagnose cooling system and repair as necessary.
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