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?|||its the intake gaskets that were a problem in those years, you need to get the engine in to the shop and have them find out, because at this point, you still have one. But keep overheating and it will blow the headgasket. get it to the shop, and have them check it out. I checked to see if there were any safety recalls there are none, I did find one reference to an overheating problem but it was specifically related to the filler neck of the radiator being rough inside and causing overheating by coolant loss. If this is a problem you sand the filler neck smooth and replace radiator cap.|||In today's world we think we can Do everything ourselves, but what I find is that guessing out possible causes until we fix the problem often costs more than actually have a certified mechanic telling you whats wrong with it. I suggest taking it somewhere that you know it reasonable in pricing that could tell you why its overheating. Good luck|||if you dont hear the fans coming on, that is part of the issue. the thermostat only controls when the coolant can flow through the radiator. over heating after that point is due to a lack of air flow after that point.|||Head gaskets are common on those, the head bolts fail. Have a compression test done, and a combustion gas test done.|||make sure cooling fan is coming on if it is your coolant gauge may not be reading right could be coolant temp sensor|||Buy a decent car