Miata Mailing List: February 1994, Message #138
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   From: GOZUMM@JEFLIN.TJU.EDU
Subject: RE: MIATA digest 180
   Date: Wed, 9 Feb 1994 09:58:08 -0500

In regards to window defogging.

I think everyone knows its caused by the difference in
temperature (primarily) and humidity (secondarily) between
the outside environs and the passenger compartment.

You can defog a window by blowing warm, dry air onto it
(a defogger) or dehumidify the air (via an airconditioner).
Both methods are effective if you localize the effect to
the offending spot or completely dry the air.

Localizing defogging to a particular spot is how those
wire defoggers work and drying the air is how the
air conditioners function.  Both can be 100% effective.

If you're having trouble defogging with your airconditioners
(which some say they use infrequently) watch out, you probably
have leaked coolant and they really don't work anymore (except
by blowing outside air into the passenger compartment).

In closing, those wire defoggers work by warming the particular spot to a point 
where the heat elminates the water vapor from condesning on the glass pane.

marv