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If it was me I would try just running one to see what happened before changing the shrouds.
If you just want to try on I would block off the hole where the fan you are not running was with just a simple piece of cardboard and test it out. If you turn off the air will draw through it instead of the radiator. The air is gunna want to travel in the path of least resistance and the open fan will be it and you will not be moving all the air through the radiator. Very simple to test correctly.