My car still has the blower for the demist as well, but as the added fan effectively blocks the intake for the heater when it isn't running, both would have to be on in order to demist the car.
A heated windscreen would be an interesting option. Jaguar on the Mk2 and S-Type (the 60's version) with a generator had an optional heated rear screen, with a somewhat comparable area of glass heated. They do work (at least it does on my 3.8 S-Type) and don't draw enough voltage to overrun that generator, so you may be fine with the stock generator on the Bristol without installing an alternator. I'm not sure how it's output compares to that of the Jaguar's, however. Heating elements do draw quite a few amps, but the demisting elements don't need to generate much heat to be effective.
--Alex Haugland
Eugene, Oregon
USA
1953 Bristol 401
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