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Booo... Hissss..

I knew you threw me a curve ball with that other fan..

..anyway, the fans are wired in parallel, so it will run with just one .
as far as speed , there is no high fan and low fan motor, The speed is determined with which circuit is being used
The low speed is the a/c circuit , using the dropping resistor to get low fans .. and the high speed is the engine coolant temp sensor hitting 105 C and sending power to the fans without the dropping resistor , resulting in full power/high fan..two different circuits sharing common fan motors only..
but with a bad motor , you will blow fuses, no matter which speed/system you are using..