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The BMW Range
3 Series
E46
A question on expansion tank
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<blockquote data-quote="jarance" data-source="post: 338036" data-attributes="member: 21"><p>If the expansion tank is "overfill", it will result in overpressure when the coolant expand due to rise in temperature. Please take note water is not compressible whereas air is.</p><p></p><p>So it is more likely that coolant will splash out when it heated up. Hence do not overfill the expansion tank and bleed it properly to get rid of air lock.</p></blockquote><p></p>
[QUOTE="jarance, post: 338036, member: 21"] If the expansion tank is "overfill", it will result in overpressure when the coolant expand due to rise in temperature. Please take note water is not compressible whereas air is. So it is more likely that coolant will splash out when it heated up. Hence do not overfill the expansion tank and bleed it properly to get rid of air lock. [/QUOTE]
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A question on expansion tank
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