This depends on if you are taking the car to a mechanic or doing the work yourself.If you are having a mechanic do this, have them replace the timing belt and timing belt tensioner as well. Expect to...
I own a '91 Probe GL, which is 4 cylinders, and the thermostat is located in the housing which is at the engine end of the radiator hose coming from the top side of the radiator. Just look for that...