Beeping!
Hey man,
The beeping could be a number of things! Chek your instrument panel see if any of your warning lights aren't workin ( Check engine, warning lamps that appear in dash), cause there could be a bad bulb and it doesnt eluminate but the warning bell goes off, I recently just got a 1986 gt fastback, and it does the same thing from time too time when the service engine light goes on and come off, other than that idk! hope that sheds some light if i figure it out i will let you know!