I would say the engine mount might be the cause.

Check the fan clutch to see if there is any bearing play that might let your
fan blade wobble.

Check the fan shroud and make sure it is mounted correctly, the two tabs on
the bottom goes in the slot of the radiator.

Make sure th radiator is mounted correctly... Any front end accident on this
car? (that could push the radiator inward)

Last thing... if the cooling fan blade is plastic, make sure it is not
cracked