Ac drain pluged and leaks inside pass front , how do you correct this??

Hallo
in general you have to disasembly complete ventilation and clean it. It is a lot of work. I usualy fix this bit difrent: I drill a small hole (4mm) from inside the car (co driver side.bottom black plastic ventilation box). Just on oposite side where the drain is. then go inside with some hard wire and clean the drain and on the end blow some compresed air. usualy some leaves block it becouse Grand cherokee does not have cabin filter. On the end put some screw in the hole that wather will not drop in the car and you can use it if it clogs again some day.
Marko