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Faced with a similar problem with an elderly foreign car I found that thing in the middle is a "thermal fuse". It blows when things get too hot and is usually why these things "fail". In my case because the fan was dirty and in need of lubrication. It blew the one replacement resistor pack I found before I rehabbed the fan. Got the fan fixed but no more resistors. Finally got one for a similar vehicle, clipped the thermal fuse out and soldered it to my resistor pack. OK, it took two tries, I blew the first one with the soldering gun, got it too hot. Second one I crimped the wires in place and then just gave each end a dab of solder to keep them secure. That was about five years ago and it's still going strong.
You can test for this by jumpering the fuse and seeing if you have lower fan speeds. You can run the resistor pack out of the box but be aware that some of those coils actually get glowing hot without the fan's airflow, be quick and careful. If you end up trying to swap a thermal fuse like I did, a buddy who solders electronics and stuff pretty regularly would be a great help. Higher quality soldering tools and a practiced hand make a big difference on these things.
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