I am still having a hard time buying into this logic. If there is liquid on
the coil there would have to be liquid on the glass, the case & every other
part of the interior of the car. I don't believe that the coil has a higher
affinity for moisture that any other component. If the coil actually gets hot
enough to vaporize liquid, then I agree that the moisture content of the air
inside
the case would increase & then could re-condense, if the air came into
contact with a surface that was below the dew point of the air. Simply heating
up
the air without increasing the moisture content would not do it. Another
possible source of moisture is from a person's breath, but I would expect the
condensation to form on the outside of the glass, not inside.
Gary Hodson
In a message dated 1/5/2006 11:57:38 AM Central Standard Time,
jnew@hazelden.ca writes:
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.
Sound plausible?
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