I looks like the previous owner had already replaced the expansion tank since the part is from behr but there was no thermostat in the mounting bracket.
E46 radiator drain plug manual.
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Disconnect the temp sensor in the lower radiator hose.
Pull out the clip that holds the expansion tank to the mounting plate.
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Remove the drain plug on the passenger side of the engine block and drain the coolant out of the block.
I take a close look at the radiator drain plug system on my 1 series bmw.
My only small issues was the radiator came with a manual drain plug i didn t know this and almost installed it with that plug.
After removing the expansion tank i did not see a thermostat in there.
See links to purchase parts and tools below the bmw blogs are wrong.
Drain plug washer 07 11 9 963 200.
Remove the radiator drain plug and drain the coolant.
Bapmic 24117552349 engine oil pan drain plug with seal ring for bmw e39 e46 e60 e90 e31 z8 e52.
Bmw e46 3 series radiator aftermarket 17119071519 or 17119071518.