On my 603, there's a driver side foot level air intake

[412usa]

Kevin, My 412 has A/C but I don't use it too often, except in the
circumstances you mention, being stopped in traffic. Ottawa in the summer
can be very hot and humid and we use the A/C in my Subaru and my wife's BMW
all the time. It doesn't seem as necessary in the Bristol. It is a separate
system ( see page 336 in Balfour's book) and yes it would have been very
difficult to incorporate as a combined system. If it's very hot we are
unlikely to have the roof on anyway.

Peter