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overheating problems

In message <19980312170840.28513.qmail@hotmail.com> "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.)

 Phil Payne
 UK Audi [ur-]quattro Owners Club