The fan is to cool down the carburetor, OEM, it usually comes on automatically with a thermo switch located under the intake manifold, however they break and are hard to find. Keep it.
Here's what I did with mine, it's about half way down the page: https://forum.ih8mud.com/threads/1978-fj40-2f-and-tranny-re-seal-project.812607/page-3
Before:
After:
Here's what I did with mine, it's about half way down the page: https://forum.ih8mud.com/threads/1978-fj40-2f-and-tranny-re-seal-project.812607/page-3
Before:
After:
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