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Old 08-18-2012, 01:47 PM   #4
computerwhiz1
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Join Date: Jan 2011
Location: Alabama
Posts: 56
My Ride: 2000 323i Sedan
It is a 32mm nut, but you can also substitute a 1 and 1/4" if you can't find a 32mm where you live. Personally I just put the wrench on the nut and give it a good whack with a mallet to avoid having to use special tools. That technique has worked for me lots of times, but use it at your own risk and be careful not to smack the side of your expansion tank with the mallet. REVERSE threads btw.
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