I've seen replacing the cap fix hot running cars . . . never. But "they" say it can happen. After the car is warmed up, protect your hands with some gloves from the heat and squeeze the large water hose coming off the radiator. The hose should feel like it's under pressure. If the hose does not feel like it's under pressure, buy a new radiator cap. I bet a new cap did not come with your new radiator, or did it? One time I did this little test and the radiator cap started hissing and gurgling when I squeezed the hose, so I knew the radiator cap was not making a tight seal and needed to be replaced.
"Straight-line acceleration is probably the first aspect of automotive performance that any intelligent driver gets bored with." Peter Gregg "We owe a lot to the dragsters. They always break something, figure out a way to beef up the part and then the benefit trickles down." Robo "Not everything that can be counted counts. Not everything that counts can be counted." Einstein
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