Hello. I'm Harry. My next move in your situation would be to pull the fan or and run direct power to it's leads. It should run fast and smoothly. Any different than that means that you simply need a new fan. I'm including instructions on how to pull the fans out for testing.
Once you have it out, run 2 wires from your battery terminals to the connector for the fan. The fan should kick on if the wires are connected correctly.
Let us know what you find and we'll go from there.
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Monday, April 26th, 2021 AT 12:39 PM