on one of our F150's we have a lower portion of the windshield fogging up on the outside, in fact the condensate is so heavy that the water is running up the windshield

there is cold air coming out the defroster vents, is this the famous blend door problem that is listed

I did a search, but did not get a concrete answer.

i see post about replacing the blend door and what a job that appears to be

do we have the blend door problem

I call myself searching

thanks

 

Do you have temperature control of the HVAC system? If not, then the blend door is not the probelm. Just turn the temperature control up and use warmer air for the defrost.

The condensation is just the outside humidity condensing on the clod glass.

Identify your vehicle.

Steve

 

lets see....I knew I forgot something

2006 f150 XLT extended cab

33,000 miles

manual a/c control

factory tint I have the privacy tint....special order item

location mobile alabama

air temp 90 degrees humidity 57% about norm for mobile alabama

a/c is cooling but it feels that it is lacking coldness

i can change the temperature manually and moisture will go away, but a/c temp feels warm,

today in 90 degree heat you can feel the cold air blowing on windshield you feel a coolness and a slight movement of air from the defrost vents

driving down the road at lunch, lower windshield is getting some condensate on the outside and the drops trying to blow/move up the windshield. this was while driving arround in the downtown area, in/on residential strees, lots of tree covered areas and trees, relative slow to moderate speeds, Mobile is covered in trees, many visitors are amazed at the size and numbers of trees we have, anyway back to the problem at hand....

until last week this truck was fine, we had had no problems and there was no condensate collecting on the outside of the windshield.

we had a 91 tarus that started to blow all the cold a/c flow on the windshield about 5 years ago. infact the windshield fogged/condensed on the outside and you had to use the wipers to drive we asked and were told repair was aboiut $2000.00, so we ran vehicle through the winter and did not use the a/c and disposed of the vehicle withouit repairing, told new owner a/c had problems and we would not fix due to cost. car had 250,000 miles and was a road car until a/c problem.

A couple of places quoted about the same, we never got a straight answer as to what the problem was. it blew some cold air out vents but most out defroster

any clue

do you need any additional information? ask and I will provide.

 

Mobile is a very pretty place (used to work for a company headquartered there years back) but it's as humid as can be.

Again, the condensation is just that. By itself, it is not indicative of a problem.

However, if you cannot properly control airflow outlets, temperature, and/or blower speed, then you have a problem.

Steve

 

Why are you running around with the defoster on? I work in pensacola and it's been hotter than heck,when I drive You better belive the air the blowing outthe front. Just wondering

 

Try a 5 degree north PA winter, heat will be your best friend.

 

defrost is not on

have a/c blowing out dash or floor or combo and the windshield is still fogging up on the outside, no matter what the choice, the outside still foggs

the other 5 2006's that we have are not doing this

we took mine and 2 others over to Baldwin County to pick up some stuff
and mine was the only one with fogged up

it is just as hot and humid here as in pensacola which is appx 60 miles apart

the fogging really gets bad on humid mornings

upping the temp setting, cab just feels warm

by the way all 6 trucks are the same spec. they were special order

there must be a problem, but what is it

we have never had a vehicle do this to this magnitude

 

I'll just throw a few things out. Probably way off base but since it's a unique issue you shouldn't rule anything out offhand.

Windshield not sealed off well? Possible cabin air seaping outside around the edge of the windshield and condensating?

Any coolant or w.s. washer fluid leaks under the hood? Vapor could be flowing out and up the windshield and condensating?

Engine fan working like it should?

Engine temp the same on all trucks?

Since you have identical trucks that will not produce the same symptoms it's obvious there is something wrong that can't be blamed on the ambient temp or humidity. Have you done anything different to your truck that wasn't done to the others? Are there any other odd things happening with yours that's not with the others?

 

to your questions
Windshield not sealed off well? Possible cabin air seaping outside around the edge of the windshield and condensating?
not a leak to the otside see above no coolness outside on hot day
Any coolant or w.s. washer fluid leaks under the hood? Vapor could be flowing out and up the windshield and condensating?
no leaks
Engine fan working like it should?
best we can tell
Engine temp the same on all trucks?
a neighbor has a scan guage and the temps show the same



all 6 trucks are as they came from the factory no mods no repairs, just scheduled maintenace as per the book

if you look at the earlier posts on this truck you can feel a a cold draft from the defroster vents that blows or drifts up on the inside of the windshield

you would think that something was closing completely or opening completely causing some air flow or drift on the windshield

remember this is a feeling of cold coming from the defrost vents.
if it is flowing cooled air it is very slight..

or else the a/c is working really well on this truck and the a/c is just cooling the metal, plasic. etc in the dash

I am trying to get some idea, the last time we had a heater core replaced on a Taurus, it cost $1800.00. If we know where to look we may be able to do a fix ourselves




I might add that this truck has had a fogged windshield problem on the inside after we have had a rain and the truck has set with out use. With the truck sitting outside and the temperture drops, the inside cabin windows fog on the inside, this is not same problem because the truck is just sitting.
I might add that if the truck is under cover or is operating during/after the rain there is no foggong Remember this is not the same problem that I am asking about. 2 dealers have looked at and can not replicate the fogging
we think it is a leaks somewhere. or moisture from the wetside door panels coming back into the cabin water evaporates and finds its way into the cabin

one of the othere trucks keeps having warped rims, even when we swap drivers, but this si not the subject here so please do not respond to the rim or apparent cab leak problem

 

I was just grasping at straws anyways. The blend door problem could account for the cold air out the defrost but I don't know about the condensate. I haven't had any experience with the blend door problem so can't say for sure.

I know I run my a/c on defrost-floor sometimes when the wife is with me and have never had such a problem but then again we're in different environments.

The rain/fogging problem could somehow be linked to it since they have something in common.

 

From the sounds of it (based on your additional information), I'd suspect one of the doors inside the plenum is not closing quite all the way and is allowing defroster airflow when it shouldn't for example, when in the PANEL setting.

Unfortunately, the factory shop manual for the '06 doesn't go into any detail on the airflow doors (that I've found so far) and I haven't had the pleasure of dash-diving into one of the newer trucks yet, so I'm making guess based on how the plenum was laid out in the previous generation of trucks.

As to the interior fogging, a quick check of the evaporator drain would be the first thing I'd check. Make certain it can drain the condensate out properly.

Steve