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.