This little switch is mounted on the back side of your interior temperature control panel on most 1969-72 Ford products. It energizes the A/C pump when you move the the knob to the "A/C" position. 15 AMP micro switch. Starting sometime in 1972, this switch was incorporated with the vacuum selector manifold. This is part of the switch assembly C9ZZ-19B888-A.
Tested and guaranteed to work, originally produced by Cherry Electrical Corp.