Where is the thermostat on your 1992 Geo Metro?

On my 91 Lsi (1ltr 3cyl) the thermostat is directly under the distributor cap. Follow the upper radiator hose from the radiator to the engine block, under the distributor. The hose is connected to the thermostat housing, which is connected to the engine by two bolts. If you replace your thermostat don't forget a new gasket.