No. 18 Cooling System Concerns-Runs Cold: Notes

WARNING: This page is about a different car, the 2017 Mazda 3. However, it is still accessible from the selected car via links, so may be relevant.

NO. 18 COOLING SYSTEM CONCERNS-RUNS COLD (SKYACTIV-G 2.0, SKYACTIV-G 2.5) DESCRIPTION AND POSSIBLE CAUSE

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

CAUTION:

Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.