guys i have water leaking in my passenger floor board from somewhere.usually that means heater core,but this is pure water,no anti-freeze,and no foggy windows.it's also not the windshield,it does it rain or shine.

 

I would put my finger on it that it is the drain for the a/c evaporator is plugged up. The company I used to work for had a bunch of Nissan pickups and this would happen every summer. Dirt gets into the drain from the outside and plugs the hose. Crawl under the truck and look for a small rubber elbow or something protruding from the firewall. That is most likely going to be it.

 

if it does it in sunny weather it has to be coming from ac

 

if it does it when it rains, check the seal around the cab brake light and or the cab clearance lights.. just replaced mine around cab light...

 

will it do it when the a/c is not running?

 

no

 

than where's it comin from?

 

mine was leaking when it rained... then it would stay in the cab because the padding would be soaked.. i took every piece of the interior out and sprayed water all around the cab and it was leaking in through the third break light, and running around the back glass and dripping behind the panel that covers the rear seat belt.. so it was wet even when it was beautiful out. . . sorry if you've checked that already, but it appears to be a fairly common problem...

oh yeah, and i sucked the water out several times with a vacuum before i actually found the leak... anyways, good luck!

 

it can not rain for a week and it comes in on top of my rubber mat.

 

ah, i see.... sounds to me like a real problem.... so the gremlins must be getting in your truck and pouring water on the floorboard.... sorry i don't have a clue where else it would be comin from...