When do the fans on a 2006 Elantra start running? To the radiator.
If you are asking for an exact temperature, that I don't know, but they come on at a factory default temperature setting when the coolant gets hot enough that the air flow, at slow speeds or idle, is not enough to keep the coolant temperature down to acceptable levels and prevent engine overheating
Turn the air conditioning on they should kick on right away that will let you know if the fan is bad or not . If they don't the fan is bad. Let it run at an idle for awhile and watch the temp guage an see if and when they kick on if they don't your sensor is bad. But DavidH25 is right they are factory set
they should come on between 210-215 degrees. and yes they should also come on when the air conditioning comes on, but only if the a/c works.
on a 97 Hyundai elantra the rad fans come on with ign go off at temp
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