Aux Fans - 560SEL

Can't quite decide what went wrong. Drivers side (left) Aux Fan seized up, passenger side OK. Direction of rotation was clockwise. Unplugged Drivers
side fan while awaiting delivcery of replacement fan. Passenger side fan continued to rotate clockwise. Installed new Drivers side fan. Both fans now operate--counterclockwise. Swapped leads, disconnected this fan or that one--same result -- aux fans spin counterclockwise, against the flow of air through the radiator.
Any thoughts on what went wrong or what I should check??
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main feed has to be reversed
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