I have an 06 SE and mine does the same thing when its really hot out. I took it to the dealer and they said there was a service bulletin about the fan rattling. The put some insulation somewhere but the fan is still loud. They said that its normal.
The problem is the bottom tabs on the fan housing are very loose.....I just removed the fan housing, put a small piece (maybe 1"X1") of foam tape in the tab holes and reinstalled the fan.....no more noise.....very easy to do yourself. I am sure the dealer does something similar.