AC/Heat Fan Switch Testing

[Calif240]

Anyone have a good recommendation on how to test the fan switch for my '69 with AC? I've got the box apart and have successfully tested the vacuum pods and a few other areas. However, I'm trying to be sure all of my wiring and switches are still good... not sure of the best way to test the fan switch. Also, I was reading the article on mopar magazine about heater box re-build. It says that the box is fiberglass. Mine is metal. Was mine repaired at some point, or was this normal on the AC boxes?

Thanks...

[C928BRAN]

do you mean the one, that is square, and attaches directly to the box with 2 screws, or the one on the dash itself?

[Calif240]

I mean the fan switch on the right side of the AC control panel. It has a low, medium, and high setting. It has three wires, usually light green, dark green, and black or tan. It controls the speed of the fan.
Thanks

[C928BRAN]

I BELIEVE YOU CAN CHECK IT WITH AN OHM METER