After I shut my car off it makes this noise coming from the front end of the car right near the battery. I have no idea what it could be. It's not the fan, and it only does it sometimes, but when it makes the noise it doesn't seem to stop. I turn the car on and shut it off and sometimes it'll stop making it. My car is an 87 Formula 5-Speed with the carbed 305. Any help would be appreciated. Thanks