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cooling system
of all the possible maintanence issues associated with e39s, the cooling system demands closet attention. one 5 minute overheat and you have major, permanent damage. So...
You did the radiator. You need to replace or plan to replace soon (unless you know it was already done) the following:
Thermostat
Upper and lower hoses
waterpump
fan
fan clutch
expansion tank
it is not recommended to do a cooling system part after it breaks. It need to be done as planned maintenance. best to do it all at the same time. an overhaul is good for about 60k miles
this is another fairly easy DIY
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