Where is the heater blower fan resistor on a 85 corvette?

On a 1985 Corvette, the blower motor resistor is located underneath the dashboard, on the passenger side. It's usually clipped or screwed to the metal ductwork near the blower motor itself. Access requires significant disassembly of the dashboard area. You'll likely need to remove parts of the glove box and possibly some trim pieces to reach it. A shop manual or online repair guides specific to the '85 Corvette will provide detailed instructions and diagrams to help with this process.