awhile ago i noticed my coolant in my radiator was down about 6 inches than normal so i filled it up no problems right? well i checked it again and its back where it was before, 6 inches below. it wasn't leaking or anything. i did some research and i learned the upper intake manifold can warp can coolant can leak into it. is that where its going? i don't think its getting burned due to a bad head gasket or else it would be a lot lower. it only stops at a certain point. whats going on?