How do you replace 1997 Honda Civic thermostat?

To replace the thermostat in a 1997 Honda Civic, first, ensure the engine is cool and disconnect the negative battery cable. Drain the coolant from the radiator, then locate the thermostat housing, which is typically near the engine block. Remove the bolts holding the housing, take out the old thermostat, and clean the mating surfaces before installing the new thermostat with a new gasket. Reassemble everything, refill the coolant, and run the engine to check for leaks.