I changed the heater core and it is leaking the small heater core pipe seems to be loose the small heater hos?

i changed the heater core on a 1995 chevy blazer 4.3 and it is now leaking in the floor board the side where the small heater hose hooks seems to be loose is there any quick fix to this besides changing the core again i must have turned that small pipe on the core before i installed it in the heater box|||You answered your own question. Take it out and if metal, re-soder it. Careful with the temperature, that brass is thin.