There is a funnel that you can buy specifically to fill the radiator. However being low would not prevent circulation. If you pop the cap and keep topping it off, the system will fill. You have a t-stat issue if it's burped and filled.
The procedures mentioned are to get the air bubbles out. It's possible the sender is reading hot due to this and the water is actually not that hot thus the t-stat is not opening up.
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