The evaporator box drain is stopped up.Under hood,under the firewall,right below the ac lines,you will find the drain.Take a small wire,like balin wire and move it in and out of the drain hole to relieve the water,it will pour out pretty good.If this doesn`t work,try compressed air pressure.I hope this helps.
Like a window unit in your house when ac runs it condenses moisture in air causes it to drip... same for auto...the condensed water has to go through a drain tube from ac box...this tube usually found on passenger side..going to outside under car,,,,if it stops up,, it will drain into inside of car....usually you can have a shop with an air compressor blow backwards through drain tube,, this usually clears the problem
Fig. View of the instrument panel assembly-Grand Cherokee
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