Yeah its similar to my 02. Here's what i think...Notice how low the fill line is on the tank, and the cap with the overflow tube has a breather. Because the fill line is so low and there's so much air, when its hot the expansion coolant fills the tank, forcing air out the breather. What you smell. Hot coolant vapors. I smell it too. And I think that low fill line exposes the coolant to more air than others causing more evaporation. I looked at my 00 corolla which uses just a tiny bit of coolant in a year. Different setup, 90% full, no air cavity. I decided to ignore the fill lines on the Camry and fill that up about 90%. Sure enough the coolant loss slowed to a trickle, and the smell on hot days from the breather disappeared. Try it, wont hurt anything.