Foggy windshield

[David H.]

[Mark E.]

Re: Foggy windshield

David,

When warm, humid air contacts cold glass, some of the moisture in the air will condense on the glass causing it to fog. Eventually, heated air will warm the glass and cause the moisture to evaporate, clearing the glass.

Cold air has less capacity to hold moisture so there's less chance of fogging.

I don't know '61s, but evidently in your car, for some reason when the heater is turned on, warm, unconditioned air blows on the right side of the windshield.

[Owen L.]

Re: Foggy windshield

Mark is spot-on. However, part of the story is missing...

Has the car been subjected to a recent rain or wash?
Does the heater put out hot air such that the fogging evaporates? If the core were plugged or airflow blocked, I don't think the answer to the question will be "yes".

[Norm B.]

Re: Foggy windshield

My first reaction was that you may have a leak at the bottom of your windshield since it is only on the one side. Other possibilities could be a window seal, a door seal, or a top seal. Is the carpet on that side dry? I am not familiar with the '61 defroster configuration and I am basing this on a similar condition I had on a Miata a few years ago. This moisture has to be coming from somewhere.