radiator was flushed out when the fan clutch was done and when the theromostat housing was done. my question is why dont it overheat faster? if im driving for over 30 minutes with no problem at all why all of a sudden does it go up and whenit goes up it goes from 1/4 to the first line in like 15 minutes. also with the new fan clutch spinning like crazy and 70 mph winds going through the car shouldnt that keep it cool?

is there a way to test the waterpump to see if its good? only problem is that i have to drive the car for over 40 minutes and get a over 85 degree day out which might be a problem since its gettin cold out again