2005 Mini Cooper S

Engine Cooling problem
2005 Mini Cooper S 6 cyl Two Wheel Drive Manual 60000 miles

I recently had the heater matrix replaced after it started leaking. After a few weeks I have started getting the same problem. It gets too hot and leaks. Smoke comes billowing out of all the air vents and it makes the carpet soaking wet. I think There is something causing the actual matrix to leak itsself as it gets soo hot but I dont know what. Can you help?
October 20, 2010.

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