Water on the front passengers floor

During heavy rains and periodically at the carwash I'll notice water on the floor of the passengers side. Any suggestions will be appreciated.

 

If you have a sunroof, make sure the drain lines are not clogged.

 

Here's guide from one of our prolific 1st gen members
https://www.tundras.com/threads/definitive-2000-2006-cab-area-rain-water-leak-thread.70464/

 

This^

 

Yeah, that guy puts out crazy content.

But seriously, @Tundra Tommy, if you look at the video posted on that 1st reply in the thread, it shows the exact cause. It's a well-known problem for these trucks. Search the thread for the word "cowl" for part numbers, instructions, etc.

 

Mine does that only when it really rains hard, just a few drops. It's rained really big time here lately and I only get a few drops. I was aware of the cowl/scupper issue, this thread helps shifty. Thought I was in for a heater core. Not really concerned about it at this time, hope the OP gets it fixed.

Funny aside: A year ago I had lots of water on the carpet/floorboards after driving with the defroster on during a big downpour. Next day, no rain, no wet floorboards. Took a trip down south and used the AC, floorboards soaked! Found the little drain tube at the bottom of the HVAC box that goes through the firewall had disintegrated. Dealer part two weeks back order. Solution (I had a 750 mile drive ahead of me) was some stock heater hose and a zip tie, worked like a dream.

 

Yup, this is the main reason for the 2nd paragraph in that definitive leak thread, gotta make sure condensate isn't the issue

And while I hear you on the "it's just a couple of drops", but here's the thing... at least down here in the SE USA, a few drops lead to foggy interior windows in the winter, and in the summer, it'll lead to a mildew outbreak in your vehicle.

Once mildew gets rooted in your interior fabric, vinyl, rubber, and plastics, you CANNOT get rid of it. All it takes is one spot you've missed, and that spot will spore your entire truck again once any humidity is in the air, and re-seed itself. It's virtually impossible to kill down to the depth of the roots, and mildew can remain dormant for years without appropriate humidity, then wake up when the conditions are right. It's especially bad with seat belt straps, because of all the dead skin "food" that's in them.

tl;dr - if you have water leaking into your cab, just fix it now and be done. The consequences of inaction are high. If it's into the passenger floorboard and not coming from EVAP backup, it's likely the cowl. Parts are cheap and I'm pretty sure the part numbers are linked up in that leak thread.

 

Thanks shifty, I've had my share of leaky trucks in the past! Appreciate the advice and will add this to the To-Do list!