I am Teh Edumacator.
Join Date: May 2005
Location: ATL, London, and Barcelona
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You can't know whether it's the water pump without taking it out and visually inspecting it. If when you take it out you find that it is plastic, do not put it back in, whether it is in one piece or not. Instead, replace it with a metal impeller pump. Obviously, if it is in one piece, uncracked, when you take it out, then the problem was not the pump.
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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.