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Fogged Windows
#729299 October 26th 2017 8:14 am
Joined: Jan 2014
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0h2me Offline OP
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Hi all,
I took, or should I say I tried to, take my 77 E-250 (460 4 barrel), to work this morning, It was about 54 degrees and raining. A little on the humid side.
She started fine, and off we go. Turned on the defrost, and all that would come out is hot humid air. Had to keep wiping the windshield. Not once in awhile but constantly, non stop.
The blower was not drying the windows, but just coating them with fog, so I finally had to park it
What would cause this to happen? The van had AC at one time, but not now. There is plenty of air flow from the (windshield), vents.

Thanks for any input.

Re: Fogged Windows
0h2me #729306 October 26th 2017 9:45 am
Joined: Nov 2013
Posts: 2,286
Likes: 153
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Hey Oh2me,

Welcome to the site!

Just spitballing here, but, heater core leaking? Airbox drain plugged? Water penetration into the airbox or ducts? Maybe the Ford guys have a better idea?

Bummer about the AC, sounds like it would surely help in your climate.

We know the defroster sucks, but will it do burnouts?


BBC Blue
1990 Chevy G30 L19 7.4 EXT
Church Van, maternity division

DogVan
1988 Dodge B250
LA series 318 Wedge 5.2 TBI A500

Cabin Cruiser
'94 Dodge B350 www.xplorermotorhome.com/
Xplorer MH model 230
230 hp LA series 360 Wedge MPI 5.9 A518 OD auto

Old vans are getting pricey!
Re: Fogged Windows
0h2me #729310 October 26th 2017 10:47 am
Joined: Aug 2001
Posts: 12,107
Likes: 37
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Working AC would definitely help this situation since the C system also functioned as an air dryer and de-humidifier. I have had multiple 75-91 Ford vans and none of them had any window fogging issues even though I live in western Washington where I get plenty of rain and it does get down to the teens in the winter.

You most likely have a failed firewall seal or weatherstrippping seal that is letting in too much moisture. As has been mentioned, a failing heater core can also cause the windshield to fog up. You want to get that looked at because having a heater core failure while you are driving is not fun at all. I had it happen to me in my 89 Ford van earlier this year. Pretty amazing smoke show in the cab.


Windows- they're what make a van worth owning!
Re: Fogged Windows
0h2me #729311 October 26th 2017 11:11 am
Joined: Jun 2010
Posts: 18,286
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Welcome to the site Oh2me ...


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB

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