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Re: Defogging in humid weather

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Re: Defogging in humid weather

Dave L30 Aug 2005 03:08
>> > Can someone please post the best method of defogging ones' winshield in
>> > humid (hot) weather?  I put my defogger on highest possible fan...and
[quoted text clipped - 9 lines]
> (and sometimes en route from one to the other, obviously), both of
> which tend to be humid.

I've had my Accord for under 2 weeks now :-).  I'm sure it'll happen again
in the future - I'm in Maryland and we get all types of weather & temps
around here and there is no lacking of humidity.  Live here and don't like
the weather?  That's ok - just wait a day and it'll change.

> I admit that the first time it happened it took me a couple of
> minutes to realize that the condensation was on the outside of the
[quoted text clipped - 20 lines]
> the inside of the windshield and allow the outside to retain more
> heat.

That makes sense.  I'll try that next time.

Michael Wojcik29 Aug 2005 20:19
> > Can someone please post the best method of defogging ones' winshield in
> > humid (hot) weather?  I put my defogger on highest possible fan...and
[quoted text clipped - 3 lines]
>
> Yes, but it only happened to me once.

Happened all the time in my '93 Civic EX.  Frequency likely depends
on what the dew point is typically like when you're driving, so it'd
be sensitive to location.  I was mostly around Boston and Cincinnati
(and sometimes en route from one to the other, obviously), both of
which tend to be humid.

I admit that the first time it happened it took me a couple of
minutes to realize that the condensation was on the outside of the
window.  It was the first day I had the car and I thought at first
that maybe I had a bad radiator and coolant vapor was leaking into
the cabin - a problem I'd had with an ancient Buick I used to drive
(somewhat affectionately known as the "Chernomobile", in honor of its
senendipitous fog-machine effects).

> I turned on my wipers to get rid of
> it.  Not sure how to prevent this from happening, except to possibly turning
> the a/c a little warmer?

That should fix the problem.  Reducing the fan speed once the inside
of the windshield is clear may also help.  Turning the defogger on
full blast directs lots of cold air at the inside of the windshield,
which tends to cool the outside of the windshield, which causes
condensation.  Simple, really.

Turning the air temp up will reduce the cooling effect, and unless
you're driving through a tropical monsoon shouldn't bother you.
Using a slower fan speed will reduce the forced convective cooling of
the inside of the windshield and allow the outside to retain more
heat.

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Michael Wojcik                  michael.wojcik@microfocus.com

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Dave L29 Aug 2005 04:30
> Can someone please post the best method of defogging ones' winshield in
> humid (hot) weather?  I put my defogger on highest possible fan...and
[quoted text clipped - 9 lines]
> of the outside fog.  Any suggestions?  Anybody else with the same
> problem?

Yes, but it only happened to me once.  I turned on my wipers to get rid of
it.  Not sure how to prevent this from happening, except to possibly turning
the a/c a little warmer?  It only happened once on my '05 Accord so I never
tested this method.  Since it is happening on the outside I can only assume
it is the colder air from the a/c that is chilling the windshield, creating
this effect.  Could this be the reason?  I'm not sure but can't imagine what
else it could be.

-Dave

imarks1@gmail.com29 Aug 2005 03:52
Can someone please post the best method of defogging ones' winshield in
humid (hot) weather?  I put my defogger on highest possible fan...and
the fog from the inside of the window goes away completely.  However,
the winshield is still fogged up from the outside and refuses to go
away without the use of my wipers.  Even then it does not go away
completeley (still a thin layer of fog)...and then returns fully in a
few seconds unless I keep my wipers on (even though its not raining).
I never had this problem before with my other cars.  It only seems to
be happening on my new 2005 Honda Acoord.  I spoke to a friend who also
purchased the same car...and he complaind of the same problem.
Neither blowing cold or hot air with or w/o the A/C seemed to get rid
of the outside fog.  Any suggestions?  Anybody else with the same
problem?

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