1994 Saturn SL2 Overheating still after new radiator?

the odometer went bad on the instrument cluster about a year and a half ago so I think it has about 150.000 miles on it. I only drive around town less than 20 miles usually - I have a work vehicle that takes most of the damage on driving.

I just thought that once the radiator is removed the two bolts holding the thermostat in are not that big a deal, $88 with the radiator still in is ok because on a Saturn the darn thing is difficult to access. IMOHO but I am just looking for a couple of worry free years from this thing