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Most likely the vacuum hose is disconnected or broken.
Does your cruise control work?
Check this out :
http://www.jeepforum.com/forum/f9/fan-always-blows-defrost-selector-doesnt-work-830241/

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Q: 99 jeep grand Cherokee Laredo-The cold air from the ac comes out of the defroster instead of the panels.The selector knob does does not work when it is plced in position on the desired settings?
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