Today I replaced the radiator on my 94 Integra LS auto with 112K miles. I have a couple questions:

1)Is it necessary to replace the thermostat on the car?
2)Also, where is the thermostat located? I've heard that it is located on the upper radiator hose attached to the engine, but I couldn't find it.
3)What is the OEM thermostat temperature, 170,180, or 190 degrees F?

Thanks a lot
- Michelle (^-^)