Cadillac: overheating, blown head gasket, pride and joy

Question
96 seville STS. ok i took it to ford cause thats where i got the car. they did test, said my thermostat was bad 290 dollars later it still was overheating then they told me my radiator was cloged so i put a brand new one in and im still having the problem. so im out of ideas please help. my cadi is my pride and joy. oh and the radiator i just took out was only 3 months old.

Answer
FIRST, What makes you think it is overheating ?.

Are you getting any check engine lights coming ON in the dash ?.

do you know how to check for computer codes ?.

Do you know how to check for a blown head gasket ?.

Are the cooling fan(s) operating ?. If you have electric fans.