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I just fixed this on my 2004 Grand Cherokee about an hour ago. I only had air/AC from the defrost vent. I read a gazillion posts about a 5 inch long vacuum line, attached to the cruise control thingy under the battery. Mine was cracked at both ends. Borrowed a section from my radiator overflow to replace it...and Wham! AC from any vent I set it at. Its a bugger to get to,,but well worth the effort. Hope it helps.

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Q: How do you find a vacuum leak on a 2004 Jeep Grand Cherokee that is effecting the cabin air vent doors from changing?
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