I made the original post on this yesterday.  It took
me about 5 minutes to thread the new foam in there.  I
don't know why anyone would want to open up the
plastic unit.  Unless one takes the window out, one
risks not getting a tight weather seal when
re-assembling.

When I did mine (yesteday), it was out of the window,
but one could do it 'in situ' with a vacumn cleaner to
suck out the old foam bits as it crumbles.  Really an
easy proceedure.

I can send pictures to anyone who wants.

--- Doug in Calif <vanagon@ASTOUND.NET> wrote:
> Mee too!
>
>   ----- Original Message -----
>   From: -- Dan Roberts
>
>   I've thought about replacing that foam but
> couldn't figure out how to get
>   it out. I'm guessing it acts as an air filter and
> air filters should be changed.

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