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Stock XJ Cherokee Tech. All XJ Non-modified/stock questions go hereXJ (84-01)
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What year is your Jeep? Mine is a 99 and does the same thing. I believe the newer Cherokees are vacuume actuated vents, so if yours is a later model, you probably have a vacuume issue.
check for vacuum leaks on the rear connections to your climate control and under the hood. your's is almost definitely a vacuum switching control. good luck