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2010 Prius II: A/C on for Defrost? - Page 3

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Posted by bwilson4web on June 26, 2011, 10:38 am

Sorry but the AC is required to dehumidify the air. Physics and
chemistry is involved and these can not be fooled. Now you have
options but they are not that much better.

1) use a water phobic chemical coating - they are available in auto
stores. I tried them but they are effective at most for only one
season. They are basicly RAIN-X compounds and work but you'll soon
find the condensation is collected in annoying specs. Every year
you'll need to clean the windshield interior and retreat.

2) pre-heat the interior - not a common approach but simply put a
500-700 W. electric heater in the car and start it up early in the
morning, say when you first get up. This will increase the window
glass temperature and lead to lower, interior fog.

In theory, but not yet tested, is an exterior windshield block. What
this will do is preserve the interior temperature and minimize window
condensation. I may try this experiment this fall.

Bob Wilson

Posted by Leftie on June 27, 2011, 5:03 am
bwilson4web wrote:

    Yes. You really don't understand "relative humidity"? Do you believe
that you need A/C to defog your windshield when it's 40 F outside? No,
you simply warm the air passing through the ventilation system; this
lowers the relative humidity of said air, drying it. If the air outside
the car is lower in moisture than the air inside (and this is often the
case) then you simply need to blow it over the windshield to defog it.
Do you honestly believe that in countries where automotive A/C is not a
common option that they can't defog their windshields...?

    I miss having a Volvo for one reason: the people in alt.autos.volvo
tend to understand both cars and physics.

Posted by Elmo P. Shagnasty on June 27, 2011, 9:36 am

You don't understand "dew point", and you conveniently ignored your
bullshit being called out when you claimed that having the AC on meant
you were being "freezed out" when that's not the case at all.

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