This is my theory-
It's clearly not needed for the 3F-E, but since the 62 and 60 used the same body panels and there was a vent already cut out on the driver's side and a big honkin hole in the engine compartment where the 60 fan mounts, someone at Toyota during project development meetings just said F it, slap it in there. It won't do any harm and will seem to justify the vent in the side panel that otherwise would be doing nothing.
Bottom line: The FJ62 manifold fan is eye candy.
It's clearly not needed for the 3F-E, but since the 62 and 60 used the same body panels and there was a vent already cut out on the driver's side and a big honkin hole in the engine compartment where the 60 fan mounts, someone at Toyota during project development meetings just said F it, slap it in there. It won't do any harm and will seem to justify the vent in the side panel that otherwise would be doing nothing.
Bottom line: The FJ62 manifold fan is eye candy.