Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

2021 Mazda CX-3 AWDFACTORY OEM SERVICE PROCEDURE

No. 18 Cooling System Concerns-Runs Cold: Notes

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
Condenser fan system malfunction
Thermostat malfunction (stuck at fully open)
Foreign material penetration in engine coolant

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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