Ok, my car loses coolant over the course of, I'd say, a week and I have to keep refilling it. There's no leak that I've noticed (there is never a wet spot under my car) but it runs dry if I don't check it every couple days and then overheats. Obviously I'm losing coolant somehow but I just can not figure out where it's going! Winter's coming fast so I can't keep putting plain water in it because I'm afraid it'll freeze but I can't afford to buy coolant every week. Help?!