In my case!
I've been finding water dripping from behind the glove box.
Soaking the floor mat and fogging my windows on the inside.
The AC/heater box behind the glove box has a drain that goes through the firewall. You can see how it slopes down to a point on the inside.
On the Engine compartment side it is hard to see the small rubber hose drain.
It is a little elbow hose just under the AC lines by the exhaust manifold.
Because of the elbow, I had to use a flexible rod to snake it .
Once I got the rod through the water started draining right away.
Just thought I would share.