2016 Mazda 5 GS, Automatic TransFACTORY OEM SERVICE PROCEDURE

No. 17 Cooling System Concerns-Overheating: Notes

NO. 17 COOLING SYSTEM CONCERNS-OVERHEATING DESCRIPTION AND POSSIBLE CAUSE

17 COOLING SYSTEM CONCERNS-OVERHEATING
DESCRIPTION
  • Engine runs at higher than normal temperature/overheats.
POSSIBLE CAUSE
  • Radiator hoses damage
  • Coolant leakage
  • Leakage around heater unit
    • Leakage at coolant hoses and/or radiator
  • Improper coolant level
  • Fans reverse rotation
  • Fuse malfunction
  • Coolant overflow system malfunction
  • Poor radiator condition
  • Improper or damaged radiator cap
  • Improper water/anti-freeze mixture
  • PCM DTC is stored.
  • Improper operation of A/C system
  • Climate control unit malfunction (A/C switch malfunction or climate control unit does not determine A/C request or transmit the A/C request signal.)
    • Refrigerant pressure sensor malfunction
  • Improper operation of cooling fan control system
  • Improper tension of drive belt
  • Thermostat malfunction
  • Improper indication of low engine coolant temperature indicator light and/or high engine coolant temperature warning light
  • ECT sensor malfunction
    • Instrument cluster malfunction
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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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