You have 2 threads for the same issue. It would help if you add this picture to the previous thread to help us consolidate the responses, questions and answers.
Hello Rocketeers, Still trying to figure out this coolant thing on the Roadster. Topped off radiator a few days ago and it needed about a cup full of coolant. Overflow was empty. With the radiator filled to the top, I then brought the overflow to minimum. Now radiator is full and overflow is at...