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No. 18 Cooling System Concerns-Runs Cold: Notes

18 COOLING SYSTEM CONCERNS-RUNS COLD
DESCRIPTION 
  • Engine does not reach normal operating temperature.
POSSIBLE CAUSE 
  • Improper indication of low engine coolant temperature indicator light and/or high engine coolant temperature warning light
    • ECT sensor No. 1 malfunction
    • Instrument cluster malfunction
  • Cooling fan system malfunction
  • Thermostat malfunction (stuck at fully open)
  • Foreign material penetration in engine coolant
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