Q: Could it be Water Pump or Head Gasket? on 1993 Volvo 940

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
I noticed my reserve tank for coolant hasnt been holding coolant--I saw a small what looks like a pipe line leaking from under the car--but the other day my car was smoking after i put the heat on--it was coming from under the hood--all of my coolant then flushed out from under car too--Im wondering what could it be?
(1) Answer
You need to stop driving this car before you do damage that you can not afford.
You need to take it to a repair shop and find the coolant leak and fix it NOW!