I'm guessing the smell is more noticeable in the colder months with the heater on. I've only had it since December, so I am gonna see what the summer holds.
I havn't changed anything yet (in the process of moving). But as soon as that's done I'm gonna dive in and see what I can do about it. Hope it is something as simple as a coolant change.
It's sorta a damp musty rubbery smell.