I hate to preach, as I'm about as far from a preacher as the Reverend Al and Jesse Jackson. But there's a great book for people who are bothered by little stuff and it's called "Don't Sweat the Small Stuff. And it's all Small Stuff." And your neighbor having a fan powering that bubble in his driveway is small stuff and a noise which, if you hear it at all, will quickly fade into the din and you won't even know it's there.
We had new neighbors move in next door. We are each on 2.5 acres and our homes are about 100 feet apart. They turned their property into a farm, complete with CAKADOODLE DO roosters. Now you want to hear something annoying? And you know what, they are nice people and so live and let live. After a few months of it bothering me, I almost never hear it anymore. And they are still there crowing up a storm.
Then I'm hearing a high pitched whistle. I go near the fence and determine it's their in-ground pool filter. I know they had to hear it and were going to fix it. Took about 2 weeks and they did. Better than me going over and antagonizing them.
Having been raised in NYC, I'd rather hear a rooster crow than constant car sirens, police sirens, fire dept and ambulances wailing by. Pick your poison.
I'm sure many of you have seen this, and if you haven't remember it well the next time you choose to pick an argument with a neighbor or anyone else for that matter.