Originally posted by SBC
That defines the temperature at which the thermostat will open.
Theoretically the 170 will run cooler than the 195.

But there are lots of other variables that will define the actual operating temp.

For instance a low water level or restricted flow will run hotter no matter what thermostat you have.

Bert
How do I chek for restricted flow.

I have replaced

Radiator
Thermostat
Fan Clutch
added extra electric fan
water pump