my 2000 cadillac Seville Northstar motor is overheating, I changed the thermastat

with no luck what do I do? my 2000 cadillac Seville Northstar motor is overheating, I changed the thermastat with no luck what do I do? I need my vehicle asap for work. It has like 130,000 miles ran great until it began overheating, now with new thermastat and fresh coolant it just runs too hot. Can anyone tell me what to do without going to a shop and paying an arm and leg?
 
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