Window fogging

[Eyvind Spangen]

Now in the winter, the windows in my '86 100q is fogging. I have to
keep the fan on a high setting and defrost, and even then, the
windshield is fogging. The side windows are somewhat better, but the
rear window will be foggy if I don't use the defroster.

This is an Euro model, no AC, so no recirculation flap that can
break/jam. The coolant level is stable and I can't smell any coolant
inside the car. I have cleaned the air intake under the plastic cover.

I've tried cleaning the windows with alcohol, didn't help. Tried some
"Rain-X" treatment that should reduce fogging - it helped somewhat,
but not much.

I've checked under the carpets - dry.. I've tried driving with a
window cracked open - no difference.

Any good tips?

--
E. Spangen
'86 Audi 100 2.2 CS quattro