The blue cool engine light went off today. What does that mean?
Engine is cold or I would guess in your case it has a bad connection, most likely at the radiator.
Your Car’s Owners Manual Should Tell About The Blue Cool Engine Light. Have You Checked The Manual ?
Please tell us what it says.
“The blue cool engine light went off today. What does that mean?”
If that light went off today, my first question would be…How long was it on?
That light is supposed to indicate that the engine has not yet reached operating temperature. If the light stays on for an extended period of time, that is a pretty good indication that the cooling system thermostat is stuck in the open position, thus causing the engine to take much longer to warm up and to run cooler than it is designed to do.
So, the quick & dirty answer to your question is that the absence of that light means that your engine finally warmed up, but that is not the end of the story if you want your mystery vehicle to continue to operate properly. If an engine chronically runs too cold, you will wind up with higher gas consumption, greatly increased engine wear, and sludging of the motor oil. The latter two situations will spell an early demise for the engine.
Please fill in the blanks in your story by telling us:
The model, engine type/size, and odometer mileage of this 2008 Hyundai.
How long the “blue cool engine light” was actually turned on before it turned itself off.
Was it days?
CSA & VCD you sure are asking a lot.
Especially CSA’s suggestion to read the Owner’s Manual.
Imagine asking someone to reach a-a-a-a-l-l the way over to the glove compartment, take out the manual, and actually read the relevant section!