1. Park the vehicle and allow the engine to cool down.
2. Open the hood of the vehicle.
3. Locate the engine block. It is usually a large metal component covered with plastic or metal covers
4. Find the thermostat housing. On the 1996 Toyota Corolla, it is typically positioned on the side of the engine block, usually near the upper radiator hose.
5. The thermostat is usually enclosed within this housing. It may be held in place by bolts or clamps.
If you're having trouble locating the thermostat, refer to the vehicle's service manual or consult with a qualified mechanic.