Toyota Previa 1996 how to change thermostat?

To change the thermostat on a 1996 Toyota Previa, first ensure the engine is cool and disconnect the negative battery terminal. Drain the coolant by removing the lower radiator hose or using a drain pan. Locate the thermostat housing, usually at the engine end of the upper radiator hose; remove the housing bolts and take out the old thermostat. Install the new thermostat with the gasket in place, reassemble the housing, and refill the coolant before reconnecting the battery.