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The symptoms you describe are common to most vehicles which use a blower and MOTOR to circulate the air. There could be several reasons, but since the squealing occurs only when either mode is in use suggests that the cause is that the bushings [bearings] in the blower motor are worn and beginning to gall. If this is the cause, it will require replacement of the blower motor.j3h.

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Q: Why does your jeep Cherokee classic 99 squeal really loud when you use the heat or the AC?
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