2003-2005 Honda Civic 1.3L 4 Cyl. 2002-2005 Honda Civic 2.0L 4 Cyl. 2001-2005 Honda Civic 1.7L 4 Cyl. Heater cores transfer heat from the engine's cooling system to the inside of the vehicle. Thermostat housing and water outlets are connections that transfer coolant between the radiator and the engine block and generally house the thermostat.
