Cooling fans grinding noise with left turns - Chevy Impala Forums
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post #1 of (permalink) Old 06-14-2018 Thread Starter
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Cooling fans grinding noise with left turns

I know this sounds weird but I bought a 2010 impala police at a auction. It has 116k miles on it. Most of the time when I take a sharp left turn I get a loud grinding noise that sounds like its coming from the engine cooling fans. Once the car starts going straight the noise takes a minute or two to cease. So far it has only done it on left turns. When I came home today I pulled in the driveway and the noise is still there when the car is not moving. When I turned the car off the noise kind of winds down and stops. When the car is restarted the noise is gone until I make another left turn. The sound is definitely coming from the area around the cooling fans or the front side of the engine. What could be causing this?
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post #2 of (permalink) Old 06-15-2018
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maybe check the fans to ensure there is no debris in the way. see if any wires are near the fans so that when you turn they could swing into the blades of the fans. my computer gets a grinding noise when the wires start rubbing those fans (smaller application but the theory transfers to the larger scale of thes cars). maybe see if there is any slop in the fan bearings as a bearing not running true would cause a grating sound perhaps. can you isolate the sound to when the fans are running and no noise when the fans aren't needed?

i may be completely off in my guess work but it may be a reasonable start. other than that maybe check the bushing in the front end? like a sway bar/tie rod is moving around because of a bad bushing?
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post #3 of (permalink) Old 06-15-2018
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Originally Posted by jso2378 View Post
I know this sounds weird but I bought a 2010 impala police at a auction. It has 116k miles on it. Most of the time when I take a sharp left turn I get a loud grinding noise that sounds like its coming from the engine cooling fans. Once the car starts going straight the noise takes a minute or two to cease. So far it has only done it on left turns. When I came home today I pulled in the driveway and the noise is still there when the car is not moving. When I turned the car off the noise kind of winds down and stops. When the car is restarted the noise is gone until I make another left turn. The sound is definitely coming from the area around the cooling fans or the front side of the engine. What could be causing this?
That does sound like bad fan bearings. Try unplugging them and taking the car for a short drive with some hard left turns. No noise would indicate new fans are in order. ... Maybe decent used ones from your local bone yard.

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post #4 of (permalink) Old 06-15-2018 Thread Starter
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I took the car on a ride this morning. Drove about 2 miles and all was well until I made a left turn onto my road. It started with the grinding noise. I drove about 1/8 mile to my house making the noise all the way. I pulled into my drive,popped the hood and touching the fan housing you can feel that the fans are definitely the problem.They make a horrible noise and why left turns start them going off I have no idea. I have a pair of fans I removed from a parts car I had. I am getting ready to swap them out. If I see anything obstructing them will post.
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I changed out the fans and all is good now. Did not see where anything could have been hitting the blades or anything else that would have caused the noise to start while making left hand turns. I don't think it was just a coincidence because every time it did it (about 8 times) was in the middle of a left turn. Anyway after I removed the old fans I could spin the larger of the two by hand and could hear a faint sound of grinding. I could also wiggle the blade about 1/2" so I am pretty sure it was bad bearings.
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post #6 of (permalink) Old 06-15-2018
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Awesome!
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post #7 of (permalink) Old 06-24-2018
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A rotating fan is like a gyroscope. It wants to maintain its rotational axis. When you turn the car, you are disrupting the rotational axis and this causes physical stress to the bearing. Why left turn but not right turn? Maybe you are turning left sharper than right? Any other explanation?
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