I have an '03 325i which has suddenly started overheating. I replaced the reservoir bottle, the fan assembly, & the thermostat. Still overheating. Any ideas? Owned 5 BMWs, new prob.
Did you properly bleed the system? Maybe a fault water pump or fan not running? .http://forum.e46fanatics.com/showthread.php?t=825186
Im leaning toward the water pump.
Is there a squeaking sound while the car is running? That's a sign of a failing water pump. I'd check out the water pump.
Water pump is fine. Fan works properly, but I'm thinking maybe a computer problem. Might not be getting signal to kick in?
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