94 a/c

I have a 94 cavalier and the heater core was replaced it in. Well they busted the piece that covers it up and directs the condensation from the a/c to the out side. I sealed the broken piece so it stoped leaking water in there but it still is leaking water behind the cover. Theres like a cover over the firewall that has foam on the back side which is soaked in water. I NEED any help i can to figure this out. My carpet is getting moldy!!!!!