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If the radiator is truly plugged, backflushing will probably not clear it. I would strongly suggest having it rodded by someone that knows how to do it. When I bought my Model A 16 years ago, it overheated some, and I was directed to a gentleman who had lots of experience in rodding radiators. Afterwards he told me that something like 24 tubes were completely clogged, and he was able to successfully rod all but about 4. My car never overheats now.