am rebuilding a couple older engines, one is 7 years, the other is 10 years old, to factory specs came to think, just how important is the thermostat in the coolant line/engine block connection?
in case it matters, where these cars are located, the temperature outside never drops below 22 C (74-75 F)
during the summer, temps are commonly at 38-40 C
considering the outdoors, does the thermostat still serve a useful function?