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radiator problem

	About a month ago I replaced a leaky water pump on my 85' 318i.  
At the time I didn't have any antifreeze so I just filled it up with 
water, and everything worked fine.  Since it is starting to get cold I 
decided it would be a good idea to get some antifreeze in there before it 
gets too cold...  So I picked up some Champion antifreeze and drained the 
block and the radiator and filled it back up with the correct mixture, 
now the radiator is leaking antifreeze.  Does anyone know why??  It worked 
great until I put antifreeze in it!  The leak is coming from the 
connection between the aluminum and the plastic tank.  In the past I have 
noticed water being in that area but never enough to result in a puddle 
underneath my car.  This is my second radiator that I have bought so any 
help is much appricated!!  Thanks.