Bob,
On TR4-6's the heater flap is covered with foam plus overhang of about 1/8"
on three sides (not the back hinge side). When this heater flap is closed, the
heater's exit port is pressed into the foam creating airtight seal. When the
flap is in half way open or 'demist mode' (ie; flap is now flush with bottom of
box) the overhanging edges of foam seals the gaps around the box. This
ensures more air power to your defrost vents. When flap is fully open (down) -
the
foam doesn't play a part.
You might take some high quality dense computer packing foam and with a razor
slice off a good thin flat sheet of 1/8" stock. With plenty of weatherstrip
glue, attach foam over entire steel flap paying close attention to adhering
edges. Leave foam's edges slightly oversized at first. After glue dries,
fine-tune foam edging with razor to perfect your 'gap seal' while the flap is
in the
'demist' position.
Regards,
Carl
'63 TR4 since '74
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I am restoring a TR4 heater and during the teardown I noticed what I think w
as
the remains of a poly-foam backing on the heater door that swings open to
allow air to flow to the feet. Is that true? If so, is the poly-foam supposed
to cover the entire door as a seal?
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