It's not a switch at all. It's an actuator that moves the air recirculation door when you call for max A/C ("Inside" on the A/C control). They are available repro. Also, if you're game to look for one in the boneyard, that same actuator was used on B and C bodies in the 70's. On those cars, it's located on the interior A/C housing, next to the gas pedal. Because it's inside and not exposed to heat, they last forever in that location.
To change yours, unbolt the blower housing from the firewall and then unbolt the actuator. The evaporator is in the RH cowl on your car, so you don't have to disturb any of the refrigeration components. You MAY need to pull off the heater hoses to get the blower housing off.
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