BCE55

Not sure what it has to do with it or why this was happening, but I took my 2005 fx4 mudding today and drove through a pretty large puddle to where a little bit of water splashed up over my hood. On the way home I noticed a funny noise and saw that this black plastic box underneath the glove box box had condensation all over it and was very cold. I have never noticed this before and if anyone knows what this component is and why it may be doing this please help. Just a little worried it could be a problem!

150FX4ever

I had that same thing happen last week. I have no idea why. I didn't cross any streams or anything but it was raining pretty hard. Interested to see the response to this. Maybe something to do with the windshield wiper cowl? Mine is almost torn apart.

picaflor

maybe the A/C plenum drain tube is clogged... there is pictures here somewhere...

picaflor

here it is:
https://www.f150forum.com/f4/need-he...er-leak-36917/
and here is the TSB:
http://ww2.justanswer.com/uploads/fo..._150727_A1.pdf

Hamfisted

Yeah I'd say your drain is really clogged up. From underneath your truck you should be able to look up above the forward oxygen sensor and on the firewall you'll see a black plastic shield, it's covering your drain tube outlet. There's a TSB out to install an elbow on that outlet too. Do a search on A/C drain elbow and you'll find more on it. Pry the black plastic shield off with a long screw driver, it won't be used once you put the elbow on there.

-Mike


You can drill a 1/2" hole for a quick cleanout in this area ... don't go left of the actual drain outlet though or you'll hit the evaporator ! Cover it with black duct tape when done.





Black plastic shield over the A/C drain outlet....




Elbow installed on outlet....

BCE55

Thanks for the help both of you! This would definitely be a logical explanation for the problem and I will look into it when I get the chance. The TSB and other posts made it sound like this problem is a true leak rather than the condensation all over the box that I am experiencing. Is that still the same problem? Just want to make sure.

Hamfisted

All that condensation you're seeing on your A/C plenum is because it's colder than the surrounding air. On the right side of the evaporator the air should still be warm, or the same temp as the surrounding air, unless there is a build up of super cold water chilling it. If the drain is open and draining correctly there should be no standing super cold water on that side of the evaporator. The evaporator is inside the plenum about where the left side of the glove box comes down. To the left of the actual drain outlet you see exiting the firewall at the bottom of the plenum.


-Mike

BCE55

That makes much more sense. Thank you!