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The BMW Range
3 Series
E46
Radiator, expansion tank & water pump lifespan
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<blockquote data-quote="astroboy" data-source="post: 299610" data-attributes="member: 4527"><p>The tank has to suffer tremendous pressure, unlike JDM. It will fail mostly triggered by a failing thermostat which of course stop coolant from passing and thus building up pressure in the expansion tank.</p><p></p><p>E90 expansion tank more expensive.. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite3" alt=":(" title="Frown :(" loading="lazy" data-shortname=":(" /> <a href="http://www.bmwclubmalaysia.com/forums/showthread.php?p=340159&highlight=expansion#post340159" target="_blank">Reference here</a></p><p></p><p>However, in my 2007 model E90, it's running an electric on-demand water pump. So pressure does not build up when pump is not running, unlike traditional engine design where the pump is v-belt driven which runs constantly as long as engine has started.</p></blockquote><p></p>
[QUOTE="astroboy, post: 299610, member: 4527"] The tank has to suffer tremendous pressure, unlike JDM. It will fail mostly triggered by a failing thermostat which of course stop coolant from passing and thus building up pressure in the expansion tank. E90 expansion tank more expensive.. :( [url=http://www.bmwclubmalaysia.com/forums/showthread.php?p=340159&highlight=expansion#post340159]Reference here[/url] However, in my 2007 model E90, it's running an electric on-demand water pump. So pressure does not build up when pump is not running, unlike traditional engine design where the pump is v-belt driven which runs constantly as long as engine has started. [/QUOTE]
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Radiator, expansion tank & water pump lifespan
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