Hi Agusta,
If your car is overheating, I would find the cause rather than adding vents to the hood. Hundreds of cars run fine, without overheating, without vents.
Can we get more details about your car? What have you done to try and correct the overheating issue? What T-stat do you run? When you say it overheats, are you saying that it is spewing coolant onto the ground? Or is it based on a gauge reading?
Many more details are needed to be able to give a good recommendation...
Take care, Scott
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