I took out my thermistat out of my 1991 gt. Guage was showing it was over heating. I believe it's the original tstat since everything else on car is original one owner. The tstat is a 195 I believe I did a boil text and it opens only a small amount less then .. maybe 1/8 inch. Could that cause a over heating. Also a visual look at motor engine radiator there was no steaming. Or boiling over or weird noises.. im goi g to intsall a 160 tstat. Does all this sound ok?