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if you have access to any breakers near you, see if you can find the fan relay unit for a 1990s-early00s Volvo 850/V70.
you need 1 big power wire in (alternator + post is a good place), and two switch inputs (your factory 3-pin fan switch will do), and there are two output wires - high speed and low speed.
if you split each of those output wires to run 2 fans instead of one, you should be golden.
i have one of these Volvo relays, controlled by a 944 switch, in my car (but running the Volvo's large single fan on a non-stock radiator)
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