I also have a similar problem with my Honda Civic 2005 EX SE. On the other hand, my motor vehicle's mileage is just sixty five,000. We changed the pretty inexpensive and most commonly encountered problems involved with the temperature gauge heading up and down: thermostat, radiator cap, and supporter switch. https://codyzltbi.digiblogbox.com/47819105/top-guidelines-of-2004-honda-civic-spark-plug-gap