Over the weekend I replaced my heater core. After a couple trips to the junkyard to get it for only $30, ended up breaking the heater core cover as I was trying to take out my old leaking one. I went to the Chevy dealer to price for a new one: $80! Nope. Back to the junkyard got one for $12
Installed it, flushed radiator and now a working heater for the winter months!