Thread: Can someone check their coolant expansion tank please?
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      07-20-2016, 09:10 PM   #3
toptounov
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Drives: 2008 E90 M3
Join Date: Sep 2008
Location: Toronto, Canada

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Yes, the hole is to dump the steam or extra coolant when the water pump fails and engine starting to overheat. Just to release the pressure.
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