I just pulled my 64 truck dash heater fan control and the pull knob for heat. The speed switch was not working at all. I pulled the switch apart and was surprise to see the contacts coated with what I thought was a conductive grease. Then I realized what it was. It was a glob of graphite. Someone tried to lube the pull cable at the knob end of the cable. It lubed the switch instead. Got it cleaned up and working correctly. If your heat cable is tight, figure out a different way to lube it.


Six volt guy living in a twelve volt world