i have a 1998 ford escort zx2 and when its warm in makes a simultaneous squeak noise?

the car does have a vacuum leak but it runs fine and never over heats so is there air escaping from the leak making that noise, also we can go for 3 miles with no noise then it slightly makes a tiny noise sorta sounds like a turbo then after its really warm the car just annoyingly squeaks of and on while idle but at 2000 rpm's it start to disapate then it doesnt make it so it only squeaks while idling what is the problem?
 
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