well the rad, tstat and sensor... you still have the water pump (could leak from the weep hole for a while before it totally fails) and you have quite a bit of hoses there.
Intermittent over heating seems like an air bubble - so might as well check the WP and all hoses.
As for my cars it now has 135,500 (shes a 1990 525)
and the "other 5er" (e39) has 110,000 now. (shes a 1998 528)
Guess it's time for a new one!
--I posted this in the how high is your mileage thread--
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