do you have to replace a thermostat if the radiator is being replaced?

What is your question?

I have a 1994 Toyota Corolla with 105,000 miles. The temperature guage started fluctuating between H and C so I got off the highway and brought it to the nearest mechanic. We agreed to install a new radiator but is it necessary to install a new thermostat? The car did not show signs of actually overheating though there was a leak in the radiator and no coolant.

How long has your 1994 Toyota Corolla had this problem?

one day