water can accumulate in it then drain out afterwards.......light shop air with a blower nozzle should do the trick......

 

This is a common problem with owners who have leveled the front end of their trucks.The A/C drain is then pointed at an angle which allows air to send the water back into the box and into the cab.If your front is leveled what you need to do is add a piece of hose to the A/C drain out under the hood and it should stop.

If that is not the problem then you have the drain clogged with debris and it needs cleaned out.Take a shop vac and slide the hose over the drain and see if you can first draw any of the debris out from inside.If that doesn't help you will need to remove the blower motor and slip your hand into the box and try and remove as much debris as you can.If that still doesn't solve the issue then you may be destined for removal of the box and if you go that far you may as well change the heater core and A/C condensor while your there.

 

my 06 did it and it was the lift kit had the front up enough so the water ran out the drain hose ans back into the firewall. longer hose did the trick.

it will still leak if you dont runn a/c if you are running the defroster. The defroster uses the a/c to draw the moister out of the air whick it the purpose of the a/c. Most people think a/c cools the air but the main purpose of it is to remove moister which in turns cools the air.

good luck
keep us posted

 

that sounds logical,especially since mine has been leveled,i'll let y''all know.

 

add a hose with a elbow on it mine was a straight piece out of the fire wall

 

I added a longer piece of hose that was flexible to bend but hold its shape and a hose clamp.