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In message <firstname.lastname@example.org> "Mike Del Tergo" writes:
> The coolant system is a closed loop, never had an Audi boil over even in
> short trips to the red zone. If your temp guage is accurate, 60-70%
> should not induce boilover. Is your system holding pressure? Is the
> cap on tight, thermostat good? Is your cooling fan going on, is your
> coolant mix appropriate? My guess would be poor system pressure
> reducing your boiling point.
Also leaky head gasket letting combustion products raise pressure. Get a
dealer to check the cap is opening at the right pressure.
(Might be cheaper just to buy a new cap.)
UK Audi [ur-]quattro Owners Club