Before you junk your radiator, check the plastic nipple where the hose from the expansion tank enters the top of the radiator on the driver's (in the US) side. This is a rather fragile part - good news is that it's cheap and easy to replace. Doesn't need to be too tight (seals with an O-ring). If it's broken off (as mine was), the bit embedded in the rad can be removed by carefully turning it out with a thread extractor or (more effectively) thetapered square end of a small file. I have a feeling that a coolant leak from this area was one of the reasons my car's PO sold it. He had suffered from the dreaded water-in-transmission-fluid a couple of years previously, and the cost of a new rad and trans had clearly been a deeply moving experience.
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