There should be codes on the thermostat. You need to get those. Also, if it is a 195 degree thermostat, running 190-200 would be normal. So, there may not be an issue at all, it may have been just fine.
Note that Ames sells both a 180F and 195F thermostat.
1968 400 Coupe, verdoro green, black vinyl top, auto 1969 GTO Judge coupe, Carousel Red, manual 1971 Trans Am, cameo white, auto 1970 Buick Skylark Custom Convertible 350-4(driver), Fire Red, white top, auto 1972 Buick GS Stage 1, Royal Blue, black vinyl top, auto
