How do you replace the thermostat on a 2002 Mazda Protege?

Remove the negative battery cable, remove rad filler cap and find the lower rad hose. Get a container as when you remove the hose from the engine side, you will lose 3-4 litres of coolant. You may want to remove the air intake box that runs on top of the rad (2 10mm bolts) first. Once hose is off the thermostat is behind the cover the hose was connected to..remove the 2 12mm bolts and replace unit with a new seal. Reverse process, add new coolant and follow procedures to ensure no air lock in coolant system occurs.