I don't think one implies the other. Coolant tank failures are common. My impression is that radiator failures happen less often. I've had two coolant tank problems in seven years, and just one radiator problem.
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2013 535xi, Carbon Black, beige interior, M Sport package, HUD, DDC & ARS, ACS springs, Kelleners wheels
2010 Z4 35i, Crimson Red, beige interior, 6sp manual, Adapative Suspension
2000 528i, Cosmo Black, beige interior, Sport package (retired)
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