I guess that would be the unidentified hole on top of my heater box with no apparent purpose. I don't think I'm gonna go fishing for that, just tie-wrap those wires outta the way. Thanks for info.What year? A/C?
My 67 W/O A/C is on top of the suit case inside just to the passenger side from center. If you cannot find the 3 prong connector it is probably broken off of the fiberboard and fallen inside the suitcase as mine had done.
Tony,You can get the Blower Motor resistor from any dealership (they are still carried and produced by A/C Delco) I got mine from a local dealership that cost me $9.00. Then just get 2 sheetmetal screws and connect the harness connector and drop it into the hole and screw it into place.
It does control the speed of the blower motor when used.