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Old 06-16-2011, 06:57 PM   #5
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Join Date: Jan 2009
Location: Texas
Posts: 2,335
My Ride: '02 TIAG 330i 5spd

Well thermostat and WP are almost new, WP is less than a year old and thermostat is about half-years old. As far as I know, thermostat should be controlling coolant temperature to prevent coolant from boiling, BUT WHY did it boil??? I don't really think thermostat failed prematurely, well at least I hope so ....I'm leaning more toward aux fan..Last option would be head gasket, of course.....

I just checked cap, o-rings were fine. I guess rings couldn't hold the pressure since coolant was boiling..

Absolutely don't think so, I did replace bleeder screw when this stupid thing broke..Both cap and bleeder screw are practically new, seals are just fine

Last edited by mack89; 06-16-2011 at 06:58 PM.
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