can't keep windows defogged in the rain/winter in my '96 dodge pickup even with window cracked open....no a/c

Question

i can't seem to keep my windows defogged in the rain. i have no a/c. and having a window cracked open doesn't help. my heater blowes plently of hot air. on defrost i can keep the windshield clear but the other windows fog up. when i use the dash vents to blow on the side windows then the windshield fogs up. on either setting the rear window fogs up. any help would be appreciated. thanks

i have recieved many good ideas. thanks. i had the cooling system pressure tested and that showed no problems so would the heater core still be bad?? someone suggested the cab has a leak and untill it dries out the problem will exist, any ideas where it could be leaking from?? i have had this problem every winter fro the last 3 to 4 years. i thought maybe the heater was not pulling fresh air and was using recirculated air but i don't have a crontrol for that.

Answer 1

You may have a leaking heater core. The coolant evaporates on the window and causes the window to fog up.
Take a white paper towel and wipe the window inside. If its discolored your heater core needs replacing

Answer 2

Couple of thoughts.

1) Try blowing regular air, not hot air. As I recall, condensation forms on the warm side of the windows.

2) Haven't tried this, but you might try getting a bucket of damp-rid (calcium chloride, a hydrophilic salt) and sticking it in the back seat while you drive with the windows closed. I am not sure how quickly this works, though, or if it works at all.

Answer 3

i own a repair shop,and if it has gotten wet in the truck it will do this until it dries out,or if it has a bad heater core in it this can cause it to do that also,but i got mine wet from a window that was left down.and it did this for 2 weeks until it dried out real good,that maybe whats wrong with yours,and if its leaking somewhere in the truck that you don't know about,that will cause it,and it wont ever stop doing it until you find the leak ,and dry it out real good,,good luck,i hope this help,s.

Answer 4

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Answer 5

try using RAIN-X on the inside of your windows, I had the same problem with my camaro and it helps drastically

Answer 6

i kwo this might sound realyl wierd but if you rub an onoin on your windows they wont fog up. the enzymes in the onions prevent this.... wierd eh>.....

Answer 7

try using rain-x