So my 2000 323i's engine started to overheat and I noticed that there was an explosion of coolant all over my engine bay. I waited till the next day and slowly poured some coolant into the expansion. I waited a few seconds and coolant slowly leaked down from the bottom of the expansion onto the plastic underneath. I've been told that the radiator might need to be replaced but it seems like the expansion is really the only thing that is damaged. Just because the coolant leaks out of the expansion, I could probably just replace that. Does that sound right to anyone? And does anyone maybe have a tutorial or can lead me through the removal? It doesn't seem too hard. Thanks.