I'd agree with not trusting the glue alone to hold pickup cap foam
forever.   I also like the idea of adding metal screen over the openings
to keep out critters.  Good thinking.
   But, I wonder if using felt for this application would tend to wick
and hold moisture more than plastic closed-cell foam.  Then it may
become a breeding ground for mold and subsequently bad odors, that will
require another round of foam replacement to get rid of....
   This is why I believe that thin, closed-cell  foam is probably best
for this use in the long run.

Mike B.

On 12/12/2012 9:44 AM, Daniel O Stevens wrote:
> I used the grey felt they sell in the window & door seal isle at the hardware store.
> Cut to fit and cut the little holes for the flap retainer to press thru and snap it together like VW did originally.
> I'm just not trusting the glue on the truck cap foam to stay stuck.
>
> It's in a spool as felt wetherstrip and you'll get 19'f too much out of a 20'f roll. But it's cheap and handy for other home & auto projects.
>
> While you have the heater out, I'd suggest adding the �" square steel mesh "Hardware cloth" between the heater and the intake from outside to keep mice out of the core.. not much worse than mouse pee on a hot heatercore.
>
> Best luck
> Dan in NY
>
> It looks to me like the heater flaps are constructed with a metal base
>> =
> into
>> which a plastic rectangle was pressed, the foam seal being held =
> between the
>> plastic and the metal (don't know if the foam was stuck to the plastic
>> =
> or
>> just held in place by it).  Should I
>> =20
>> (a) leave the plastic there, and stick my foam to the plastic?
>> =20
>> (b) remove the plastic and stick my foam to the metal?
>> =20
>> (c) remove the plastic, put my foam in, stick the plastic back on?