Leaking heater core???????

[Hogaboom]

I have a 94 LT1 that when I turn the heat or defrost on any warmer than the outside temperature, the vents just blow steam and the windows will not defrost, in fact everything just gets worse. I assume it's my heater core, but wondered if anybody has experienced similar problem?

[Mekanic]

I can't tell you what your problem is specificly. All I can say is if its the heater core....prepare to cry....or sell your car. It is probably THE hardest job to do on a C4, to give a hint, 90% of it is done INSIDE the car.

Check on corvetteforum, there has been many thrreads related to this, and people have their own methods named after them.