The heater core on my 1985 z28 burst and my interior got flooded with coolant. I replaced it and there doesn't seem to be a leak coming from inside or from firewall coolant hoses.

However there's still a leak that seems to be hitting the y pipe/headers causing it to smoke up. Very small leak it appears and only happens when I turn the car off.

Any idea as to what this could be? What else usually blows when the heater core goes?

could be one of the metl heater lines has a pinhole...have you tried a pressure test?

haven't tried it yet, just installed heater core yesterday. It's strange because before the heater core went there were no leaks at all and was running fine

Could be handling the hoses damaged / jolted something loose ?

I'd say it's possible but unlikely because only 2 hoses were removed and I felt underneath them and am certain they aren't causing the leak

hmm interesting..post what you find!

will do bro

Where is the condensate drain on these cars? ANY fluid build up will come out of that drain. Might be worth checking.

Honestly not too sure, I'll look into that thanks for the heads up

is that the ac drain?

theres like a tiny hole on the bottom of the evaporator housing