Hey... I thought I knew as much about engines as the average Joe, but I wonder... Who can tell me what this little fan does (see the red box on attached picture)? I need to explain it the service adviser at my local dealer (see the dealer paper plate in the same picture). I just went in, had some radiator mounting bushings replaced, and didn't get rid of the vibration. When I look at the fan (engine running for a while and warm), it's vibrating. I can put my finger on it and push a little (puts pressure on the mounting hardware?) - Voila! the vibration stops.
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