Cooling System Concerns-Runs Cold: Notes

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.

COOLING SYSTEM CONCERNS - RUNS COLD (SKYACTIV-G) DESCRIPTION AND POSSIBLE CAUSE

Troubleshooting item	Cooling system concerns-runs cold
Description	Engine does not reach normal operating temperature.
Possible cause	ECT sensor No. 1 malfunction (value higher than actual engine coolant temperature detected) ECT sensor No. 2 malfunction (value higher than actual engine coolant temperature detected) Cooling fan system malfunction Improper operation of coolant control valve Active air shutter malfunction (With active air shutter)
System wiring diagram	Not applicable
Connector diagram	Not applicable