Somehow water leaks in on the passenger side when driving in rainy
conditions.

If I use a water hose and spray water all over the vehicle or under the hood
in the air traps or if I go to a car wash, there are no water leaks.

Also, the water comes out of the rear (back seat) air outlet exit on the
passenger side. I stuffed a rag in the outlet and it was all wet during
driving in rainfall.

The dealer thought the water was accumulation from the air conditioner that
was leaking out through the air outlet so they drilled a larger hole in the
front, under the dash where the heater box is. Driving in the summer with
the A/C on in humid weather does not create a leak.

Maybe this cured part of the problem, but the fact remains that water still
leaks in when I drive on the highway during heavy rainfall.

Does anyone have an idea where should I look for the leak ?
The dealer can't find it and needs the Jeep to be left at the shop during
rainfall.

Thank you !