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Q: how do you change the expansion tank on 2003 BMW 325xi

have pin hole in tank and need to replace
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This is not a simple process. I'd suggest a BMW specialty shop.
If you are absolutely sure you can do it, you can find great repair manuals with step-by-step instructions, diagrams, parts locations and other important information here:
Or here:
Make sure you use the OE blue antifreeze and nothing else. If there is already another coolant in the system make sure it's flushed out well.

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