I am Teh Edumacator.
Join Date: May 2005
Location: ATL, London, and Barcelona
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Yes, some of them do have crappy plastic impellers...but I don't know if that model year has them or not. You definitely are getting in the mileage zone where a new water pump would be a good idea.
It's also possible that the holes between your expansion tank and your radiator have become clogged, or that there are bubbles in your cooling system.
When you take off the oil cap, is there anything that looks pasty yellow or like cottage cheese?
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1999 E39 540i/6-VF Stage 1 S/C, Dinan exhaust, Dinan strut+shock braces, Dinan ltwt flywheel + clutch, Dinan Brembo BBK, Dinan monoball, H&R Springs, Koni Yellows, M5 sways, Dinan forged 18" wheels, &c.
1995 E38 740i. Highly modded. Faster than you.
Sold 2-28-07: 1997 E36 M3/4, 8-30-05 RIP 1997 528i
Lindsay fan club member.