Chevy Blazer S-10

88 S-10 BLAZER water pump works but on warm days it runs at 220 and with the air on runs at 240 but wont overheat why?

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05/06/2008

When the right proportions of water and anti-freeze are used, it increases the boiling point of the radiator liquid to about 260° F. Running at 240 though seems awfully high ... possibly related to the thermostat just above the water pump.