I'm going to assume you're referring only to the pressure AT THE RADIATOR CAP, since the coolant pressure varies slightly throughout the system due to the water pump and various restrictions such as the thermostat.
The pressure at the radiator cap will be equal to the VAPOR PRESSURE of the coolant for whatever temperature the coolant is at. Since vapor pressure increases with temperature, the coolant pressure will rise with temperature up until the radiator cap pressure rating is reached. At that point the coolant will boil.
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Today's Featured Article - A City Guy's First Tractor - by Fred Hambrecht. After living in apartments in Atlanta for more years than I care to remember, the wife and I decided to move to the country. Humming "Green Acres is the place for me..." we purchased a 29 acre tract about 60 miles south of Atlanta. Next came the house, I could talk about that ordeal for another two weeks... But, I want to talk about my tractor! We didn't even own a lawnmower, and all of a sudden we had enough grass to feed all the starving children of the bovine world. Naturally, I talked
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