Where is the heater core in a 1996 Oldsmobile Achieva SL?

The heater core in a 1996 Oldsmobile Achieva SL is located behind the dashboard, deep within the center of the vehicle. It's not easily accessible and requires significant disassembly of the dashboard to reach it. You'll need to consult a repair manual specific to your vehicle year and model for detailed instructions and diagrams showing the process of accessing it. This is a complex job best left to experienced mechanics.