Water leaking from "air box" below dash, passenger side.
 

Every time it rains, the carpets on the passenger side gets wet.
I've removed the carpets, and cowl vent cover (?), concluding that when i pour water into the space under the wipers, it drips from the air box under the dash.

I've done some searching reading, but haven't really seen anything that concludes my problem.

Some places I've seen that the door/flap that's underneath this cowl, is supposed to be closed when it's not on "Max AC"? Mine's always open. I've also seen some vent holes that you must remove the fender to properly locate, but they seem to be only on the Gen2?

The drain on the passenger side seems to be open, as it's quite a steady flow below the car when i pour water down there.

Any ideas to how the water get's into the vent system?

There are a couple cowl drains on both sides that lead to the fenders, pull off the cowl and check them, it seems that if it is not the heater core that is causing the floor to get wet, that is the next think in line, also, check the door weather stripping.

i would double check the drain in the air box that leads outside the firewall. its the drain that gets used all the time when the a/c evaporator core sweats and creates water. it could be plugged up with dirt.
as far as your door staying open all the time, thats what it suppose to do. the only time that door closes is when you have it on max a/c. that is the recirculation door. when it closes, it only takes air from inside the cab instead of outside. that way it can cool it down even more without having to work so hard.

where exactly is the drain you're mentioning?

It's not the door or the heater core, as it's quite easy to see that it starts to drip between the air box and the firewall as soon as I start pouring water down the cowl.

Bring Up My Post

take the cowling off and look to see where the water is going.

It goes towards the previously mentioned resirc-door, and drains down behind the fender, comes out behind the front right wheel.

Anyone knows where exactly this drain is located?

Couldn't find any drains, but I've figured that my problem is probably caused by deteriorated rubbers around the hinges, as the space below leads direcly into the fan and re-sirc door.

No. 7 on this drawing. Called "Hinge seals"
https://blazerforum.com/forum/attach...ine=1379404211

Pic taken from LMCtruck.com.