I need some suggestions on putting a non-A/C box on an A/C car. I have a non-A/C heater box from a bone yard early model thirdgen. It came with a 3 wire resistor and a 1 wire motor. The A/C cars have a 2 wire motor and a 4 wire resistor. What are my best options here? It looks like I'll have to use the early 1 wire motor due to size restraints with the non-A/C heater box. That is easy enough to wire up. I'm not sure on the resistor though. Should I use the non-ac resistor? If so, then which wires from the original 4 wire harness do I use for the non-ac 3 wire resistor?