A rule of thumb is that for every PSI an automotive cooling system is pressurised the boiling point temperature is increased by one degree Celsius...

Read more than you'd ever want to know about antifreeze here:-

http://en.wikipedia.org/wiki/Antifreeze

__________________
1992 W201 190E 1.8 171,000 km - Daily driver
1981 W123 300D ~ 100,000 miles / 160,000 km - project car stripped to the bone
1965 Land Rover Series 2a Station Wagon CIS recovery therapy!
1961 Volvo PV544 Bare metal rat rod-ish thing

I'm here to chat about cars and to help others - I'm not here "to always be right" like an internet warrior



Don't leave that there - I'll take it to bits!