Not sure if its the fan or not, but I have remote start on mine. I have noticed from time to time, I walk outside, and I'm like HOLY *****!!! It is very loud. For me, I seem to have the "ticking" problem, which is very very pronounced in my case. I just purchased a canister purge valve myself because the dealer says the ticking is normal, but my research tells me otherwise. On that note, the TSB does not show up for my truck, but anyone who has heard my truck has been left scratching there head. Mine sounds like a header gasket leak when your driving it.

I am installing the valve tonight, ordered directly from Ford. I will post back with the results, but I would say at least half my "noise" is due to some serious tapping/ticking whatever the heck it is.

I left my 6.4 and ALLLLLLLL of its problems for this truck. So far, love the truck, but I just hope it doesn't become a sack of issues like the other one.