The E46 was an amazing platform with one of the best engines that BMW ever made as far as driving goes, however its cooling system wasn’t exactly rock solid. There are a lot of common failures that need to be addressed because the one thing you do not want to do is severely overheat an M52TU/M54 engine because the cylinder head will warp, the metal in the block will fatigue and the head bolt threads will pull right out and your cylinder head gasket will fail. Basically, you'll have a really bad day, so make sure you address all the problems I list in this video.

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