How do you change thermostat on 1995 Mazda B2300?

To change the thermostat on a 1995 Mazda B2300, first, ensure the engine is cool and disconnect the negative battery cable. Drain the coolant from the radiator, then remove the upper radiator hose and the thermostat housing by unscrewing the bolts. Replace the old thermostat with the new one, ensuring the spring side faces the engine, and reassemble the housing and hose. Finally, refill the cooling system with coolant and check for leaks.