How do you replace the thermostat located on a 1996 Pontiac Transport?

To replace the thermostat on a 1996 Pontiac Transport, first, ensure the engine is cool and disconnect the negative battery cable. Drain the coolant from the radiator, then remove the upper radiator hose attached to the thermostat housing. Unbolt the thermostat housing to access the thermostat, replace it with a new unit, and reassemble by reversing the disassembly steps, ensuring to refill the coolant and check for leaks.