Where is heater control valve located on a 2000 dodge neon?

The heater control valve on a 2000 Dodge Neon is located underneath the dashboard, on the passenger side, near the firewall. It's often difficult to access without removing parts of the dashboard. Precisely locating it requires some disassembly and may even require consulting a repair manual specific to your year and model Neon. A repair manual with diagrams will be invaluable for this task.