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One possible problem with your air dam is that there is not enough pressure differential between the front of the radiator and engine side of the radiator. If you have an undertray as well, there might not be enough room for the air in the engine bay to escape. Here's an article to explain it a bit better. They ran into similar problems with an intercooler.
Tried to post a link but I don't have enough posts. Go to autospeed.com and in the search bar enter "undertrays, spoilers, and bonnet vents" There are two parts, read 'em both. Good stuff to know when modding anything that effects cooling.
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