Why does the Changan Alsvin often show a blinking “COOL” light even when the engine is warm?

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Why does the Changan Alsvin often show a blinking “COOL” light even when the engine is warm?

This warning often confuses owners—many report the coolant light blinking while the engine is clearly not cold. Could this be linked to a faulty temperature sensor, stuck thermostat, o r ECU misreading?

Zarnish asked on 11 Jun 2025 11:46:24 am

1 Answer

13 views |

Car Mechanic Expert - on 11 Jun 2025 11:50:02 am

The blinking “COOL” light is typically an indicator that the engine coolant temperature is below the threshold set by the ECU Engine Control Unit. However, in cases where the engine is already warm, this can happen due to:

Faulty coolant temperature sensor misreporting actual temperature.

Stuck-open thermostat allowing coolant to circulate prematurely, preventing the engine from reaching optimal temperature.

ECU misreading sensor data due to poor ground connection o r software glitch.

⚠️ Misleading Indicator: Many owners mistake it for a real-time cold engine warning—it’s often a sensor o r thermostat issue, not actual temperature.