Is it not possible to completely seal the gage openings after getting all the
moisture out of the gage so the next time the air inside is dry and no moisture
is condensed on the cool glass??
Ron
>In a cold gauge, when the coils heat up, they a) vaporize any liquid on
>the coil and b) heat up the air around the coil, allowing that air to
>pick up more moisture. The heat of the coil causes a convective current
>of air to travel around the inside of the gauge; the relatively warm,
>moist air comes into contact with a cool surface, and condensation forms
>(I would think condensation would form on all parts of the gauge that
>are cold, but you only notice the condensation on the glass).
>
>Eventually, the entire gauge warms up, and the condensation is
>re-evaporated into the air and the fogged glass clears.
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