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Message: <blockquote data-quote="astroboy" data-source="post: 551729" data-attributes="member: 4527">Vacuum pump is no.2 in the diagram above..The complete vacuum pump replacement instruction is here: <a href="http://tis.spaghetticoder.org/s/view.pl?1/07/09/91" target="_blank">http://tis.spaghetticoder.org/s/view.pl?1/07/09/91</a>I'm referring to the black cap underneath the vacuum pump. This cap will crack over time due to aging and coolant will seep out. Many E46 N42 and N46 suffered from this before. Apparently it's part of the header.. but my Haynes manual don't have, the online BMW TIS also don't have..<img src="http://tis.spaghetticoder.org/images/1/06/32/57.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></blockquote>