2021 Mazda CX-3 AWDFACTORY OEM SERVICE PROCEDURE

No. 17 Cooling System Concerns-Overheating: Notes

17 COOLING SYSTEM CONCERNS-OVERHEATING
DESCRIPTION
  • Engine runs at higher than normal temperature/overheats.
POSSIBLE CAUSE
  • Engine heat generation amount is excessive
    • Engine speed is high and remains high for continuous long periods
  • PCM DTC is stored
  • Improper operation of A/C system
  • Insufficient air blow volume
    • Cooling fan inoperative
      • Fan rotation speed decreases (such as generator malfunction) due to battery voltage decrease
  • Cooling system cap malfunction
  • Cooling fan motor assembly malfunction
  • Cooling fan motor connector malfunction
  • 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
  • Blown fuse
  • Engine coolant system malfunction
    • Improper engine coolant level
    • Engine coolant performance deterioration
    • Coolant leakage (engine internal, external)
    • Improper water/anti-freeze mixture
    • Thermostat malfunction (not fully open)
      • Radiator malfunction (clogging)
  • Leakage around heater unit in passenger compartment
  • Drive belt damage
CAUTION:
  • Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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