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  1. overheating and cannot find the cause

    General E46 Forum
    I have a 2000 323i automatic that is overheating,and I can't find the problem. I replaced the water pump about 5 months ago. A couple of weeks ago I noticed my low coolant light on so I added a bit of water. This became regular; I found the leak was a crack in the expansion tank. Every since...
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