Coolant tank steaming?

got a 1993 240sx, i was leaking a little bit of coolant a few days ago and have yet to refill it. today i was driving and when i pulled in my coolant tank was smoking and boiling. now o didnt drive but maybe 3 miles like that so i hope i have no major damage but could loss of coolant make it smoke? or could it be... show more got a 1993 240sx, i was leaking a little bit of coolant a few days ago and have yet to refill it. today i was driving and when i pulled in my coolant tank was smoking and boiling. now o didnt drive but maybe 3 miles like that so i hope i have no major damage but could loss of coolant make it smoke? or could it be something else?
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