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I should have suggested a specific solution.
A simple bi-metallic switch can easily handle the current for a few 12VDC fans. Something like a series 36T Therm-O-Disc, which handles up to 10 amps, would do nicely.
Most are built in large batches for a specific product, but they are easy to find as surplus parts from a production run. There are some on FleaBay right now, 45C N/O (i.e. they close when the temperature gets hotter than 45C) priced at 2 for $2.
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