I've had a small coolant leak since this past summer, however, I've been away for quite some time and leaving for another 6 months shortly so it's not a huge issue right now, but I'd like take care of it regardless (duh). I just went to put more coolant in when I noticed some small bits of dust/dirt inside the coolant tank when I took the cap off. I'm going to assume dirt shouldn't be able to get in this system, right? Also, I'm not sure where it's leaking from in the first place.