[Grumpy old man]

The doors are allowed to Leak from the outside down into the door and out from the 2 drains in the bottom of the door ,these drains are located outside of the cab seal with the door closed so if you have a leak inside the cab you should start looking at the door seal or the lower windshield seal ,also check for rust inside the cowl and up under the dash inside .climb inside with a flashlight and have someone spray water on it until you locate the leak