Hey all.. Well, my windshield reservoir as doubled most excellently as a radiator recovery tank. The radiator sucks coolant out of it, but for some reason, never replaces the coolant. Why is that? I poured half a gallon of Sierra Ready to Use into the reservoir 3 days ago and now all of it is gone never to be seen again. It isn't leaking, I've thoroughly checked for that possibility. What the heck is going on?