I am trying to understand the whole pressure situation with the cooling system. Is it supposed to operate under pressure? The previous owner of my car installed the self-bleeder arrangement. If the bleeder continuously bleeds air, doesn't that mean the system cannot pressurize if air/fluid is always "bleeding" from the system, or am I not quite understanding how this system works? I also didn't think the condition of my overflow bottle cap wasn't that important, either, since I had the bleeder and that any overflow would simply exit the overflow tube? What is the relationship between pressure, the cap, bleeder arrangement and overflow tube from the bottle. I don't see how they work together. Thanks, Paul vin 10944 To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/