BMW E39 528i: Thermostat Housing DIY Insight
Lesson Learned: at least on my 1997 528i sedan, the radiator shroud can be removed, and replaced, with the fan still installed on the fan clutch. I had to replace a leaky thermostat housing/radiator hose connector on my 1997 528i sedan. RealOEM.com indicates that two different radiator options were available on this vehicle. Mine is the one with the separate overflow tank on the passenger side of the radiator.