How about (for a good pump) - 'One that circulates sufficient coolant for the engine under all conditions'? BTW did you find bits of the old impeller? Where did they go? When the air is cool and the thermostat fully open your water pump was able to keep up. Had the air been hotter and running the air con I guess it would boil, given time.
Good - Fast - Cheap: Pick any two.
3 x E32 735iL (Alpine White, Glacier Blue & Kashmir Beige); 2 X E38 735iL (Oxford Green & Alpine White); E53 X5 4.4i (Pearl Beige); R50 Cooper; R55 Cooper Clubman (Both Pure Silver).
E38 Parts Car
E21 318i; E23 735i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
I've just changed my wiper blades and now my reverse lights don't work. Should I change my fuel pump relay?
Last edited by BMWFatherFigure; 10-17-2012 at 10:28 PM.