Cooling system problems are well-documented on the 528i. Sorry - it's normal for the E39. Often, it is the plastic expansion tank that goes first. I've had to replace the radiator on mine too, which is another normal problem area. My 528i now has 250K kms, which translates into approx 150K miles. Yours isn't doing to bad if it is just the coolant tank. Also, if your car has an automatic transmission, it has also hopefully had a transmission overhaul in the past, or expect another really expensive fix in the future.
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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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