Username Password Remember me Forgotten your password?? No account yet? Create one
Site Search Forum Search Chat Links Store Calendar Auto News Forum '02 FAQs Home
Home
BMW 2002 FAQ Forum Index -> General Discussion Edit post Username Subject Message body  Font colour: Default Dark Red Red Orange Brown Yellow Green Olive Cyan Blue Dark Blue Indigo Violet White Black  Font size: Tiny Small Normal Large Huge Close Tags [quote="CharleyII"]check the rubber seals on the rad cap. if there's a crack/tear in the the release valve seal (the small one) it allow your system to depressurize which will effectively lower the boiling point of the coolant and it'll just vaporize. the disapearing coolant trick :)[/quote] Options HTML is ON BBCode is ON Smilies are OFF Disable HTML in this post Disable BBCode in this post   All times are GMT - 7 Hours Jump to: Select a forum Forums----------------General DiscussionArchiveProject Blogs Social----------------EventsOff-TopicOT - Politics and Controversy Classifieds----------------CarsParts For SaleParts Wanted Administrative----------------FAQ Articles Construction ZoneSite Suggestions and QuestionsTest Forum Useless----------------Personal Attacks  into the overflow vent. I haven't had this problem on an o2, but I have needed to get a cap rated for a higher psi on a vehicle before to keep what your explaining from happening. Yours just may be worn out. Maybe someone a little more sure of themselves can pipe in... speaking of which, my 02 always runs hot, maybe I should get on that... Mac
BigDog	Posted: 12-13-05 07:09    Post subject: Weird cooling system behaviour... Figure this one out... So the other day I notice the temp gauge moves more than normal. Seems everything is fine, then I notice it's HOTTER than usual, not screaming off the charts, just hotter than normal. Then a while later it's back to normal. Weird. So I check the coolant level and find I"m down to about where the top hose comes in. I filler up and get on with my driving about. Check coolant next day, and yes, it's down there again!!! I figure got a leak someplace. I look and look, re-do a couple hoses for good measure, and yet, it does it again! I can't figure where it's leaking, so I put a plastic bottle on the overflow vent, and sure enough, it filled up! So now at least I know WHERE the coolant is going, the question is WHY is it doing this????? With the fluctuations in temp I think maybe my thermostat is failing? Closing when the motor is hot, re-openning when it gets hotter??? Does this make sense at all??? No noise from the H2O pump at all, no squeeky belts, no howling bearings, it seems to be working nominally. Coolant looks fine, no signs of unusual stuff in there, no large quantities of oil or anything else. No sign of coolant in the engine oil or in the valve cover. No chance it's burning any coolant, the plugs look good, and with the temps this time of year you'd see the condensate coming out the tail pipe for certain! I'm baffled, I think the thermostat maybe the cause? Anybody have similar excperiences??? ----------------- BigDog '76 20002 Maybe trying a new thermostat tomorrow!

-->