i just checked schems for you; presume your car is 2000 or later?
each fan has two relays (total 4 for the front) - high speed each side, low speed each side.
common ground on each side, common power each side, so no reason any kind of failure on one side would impact the other. just unlucky?
i could email schems to you if your email can handle 22 MB (not sure mine can, honestly)?
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