what are the steps I need to do to replace the heatercore? on 1990 Chevrolet Cavalier

I need to know the steps i need to take after deasselbling the dash?

Asked by for the 1990 Chevrolet Cavalier
if you already disassembled the dash, you just need to recover refrigerant from lines, drain coolant and remove the vent box assembly and disassemble it.