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when my heater tap went it didnt start off with a fine spray....it went from not leaking to steam coming from the bonnet and dumping 10L of coolant on the road no mucking around here! lol
ive been meaning to do the heater core myself, they are a bitch of a job and i havnt got any money atm....maybe i will just take it off the cost of what i owe dad for his car...cause the heater core has been on the way out for about 3 years....he was to tight to fix it...now he will have to deal with it!!its the heater tap, mine literally did the exact same thing where you cant trace any leak
get ur mechanic to bypass the heater tap or core not sure which one it was and feed the hose that exits the left of your engine in a "U" straight back into the same side below where it exits. it costs like 1000 plus or somes**t to repair so thats why i get them to to that, been running for 6 months fine
up to you though lol