This is a typical BMW cooling system problem. Thats why when people post new threads about replacing 1 part of their cooling system, I tell them to replace everything. Essentially a cooling system overhaul. Some listen, some dont, others just dont know. BMW has a terrible cooling system that needs to be checked on every 30k-50k miles. I replaced my entire cooling system on my E46 just as preventive maintenance. That was almost 25k miles ago, I might be due for another soon. I am not surprised one bit by your post. Do some research on the web and on other forums. There are great DIY writeups, listing of part numbers, and scheduled maintenance. One guy on E46fanatics, is over 300,000 miles on his e46 and has overhauled his cooling system 3 times just as preventive maintenance.
If I had to guess, your lower intake boot is torn (Or was before), MAF and DISA need a cleaning, transfer case fluid needs flush ,and your shocks and struts are on the way out as well. It all just goes with owning a BMW.
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Last edited by jdauria; 03-27-2013 at 02:13 PM.