[Abarine]

Just an update: I called the guy this morning and he said that the problem was caused by an air bubble in the coolant line; he'd mentioned this to me when I picked it up but I didn't realize this is what he meant. He drove out to my house and replaced the coolant, and it seems to be fine ATM. Ever hear of that before? I work with pumps and boilers, and it makes sense (we call it air lock), but I'd not realized it could happen in car radiators.