The Ford Barn

Bob703 · 05-20-2026, 04:53 PM

My 37 Ford came with a 12-volt conversion along with a GM alternator. The alternator has the pulley fan mount on which is mounted the original 4 blade fan. I've always heard a whining noise that changes with engine speed. Sounds like the car has a blower. I've been told that 4 blade fans are noisy, so I removed it to see if the sound went away. Well, it did, almost entirely but I still hear a little.

The prior owner didn't have the car very long and either have I. So, I would be surprised if the alternator bearing went bad so fast. But maybe. Before a buy another alternator I was wondering if changing the fan would improve things.

I have also read that 2 bladed, aluminum fans moved more air. any suggestion? Thanks

05-20-2026, 04:53 PM	#1
Bob703 Junior Member Join Date: Apr 2024 Posts: 6	Fan Noise My 37 Ford came with a 12-volt conversion along with a GM alternator. The alternator has the pulley fan mount on which is mounted the original 4 blade fan. I've always heard a whining noise that changes with engine speed. Sounds like the car has a blower. I've been told that 4 blade fans are noisy, so I removed it to see if the sound went away. Well, it did, almost entirely but I still hear a little. The prior owner didn't have the car very long and either have I. So, I would be surprised if the alternator bearing went bad so fast. But maybe. Before a buy another alternator I was wondering if changing the fan would improve things. I have also read that 2 bladed, aluminum fans moved more air. any suggestion? Thanks