Excellent DIY
Excellent instructions. I did have to google the "radiator cover". After looking over pictures on google images - my car does not have one (328xi, 03/08 production date). Either someone didn't replace it or the x-drive's don't have them.
Getting the connector lock off the t-stat connector looks impossible because another part is blocking it. It's possible - be persistent.
Also, I didn't get a hissing of air after running the water pump procedure. I did it twice, with a timer - waiting 15 mins each time. I could hear the process running - took 12 mins each time. I'm disappointed I didn't get a hiss, but I checked carefully for leaks & drove her for 20 mins. All seems well.
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