The row of dash switches are mounted on a support plate. The entire plate is held to the dash by a couple of special screws or more properly described, long threaded nuts and removes as an assembly to get to the switches. There are some photos and description of process here:
https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?post_id=96321#forumpost96321 If not part of the array in the dash but is below the dash, perhaps it is aftermarket or for a separate switch to a dealer installed underseat heater?? If it is a separate switch, a picture would be helpful for one of the 22-23 series guys to say if factory or aftermarket.
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