Even if the heater valve is closed, the likelihood of condensation
within the heater matrix is exceedingly small -- too much heat from
the coolant to allow that. Look for a leak -- it has fixed every one
of these situations that I have met. Except for A/C vehicles where
the condensation does form (on the evaporator core) before the heater
core has a chance to warm it up.
Donald.
> Date: Mon, 21 Oct 2002 15:39:43 -0700
> From: Joe Curry <Spitlist@gte.net>
>
> Greg Rowe wrote:
> >
> > When I turn on the defroster on warm to clear the windshield
> > on a rainy day, inevitably the windshield fogs over before
> > slowly clearing. I know that is normally a sign of a leaking
> > heater core, but I don't think that's the case since 1) I never
> > have to add coolant 2) I don't get the smell of antifreeze in
> > the car and 3) it only happens when I put on the defroster in
> > wet conditions. I'm theorizing that it may have to do with
> > hot, moist air hitting the cold windshield and condensing.
> >
> > Does this happen to anyone else?
> >
> > Thanks!
> >
> > Greg Rowe
>
> Greg,
> This is common on many cars, not just Spits. While it could be caused
> by a leaky core, it most likely is simply due to condensation inside the
> heater box itself. When the fan is turned on, the moisture is expelled
> onto the windshield and after a while, only dry air comes out which
> dries it up. I'd say, your best solution is to warm the car up for a
> while before taking off and make sure the defroster is ON so that when
> you are ready to go, all is right with the world!
>
> Cheers,
> Joe
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