The thermostat is basically a part of the cooling system of your 1998 Honda Civic, serving a vital role of regulating the temperature of the engine. It works when the engine has already climbed beyond its normal operating temperature level. At that time, it allows the valves to open to let the liquid coolant to flow out of the radiator and through the engine blocks to collect unnecessary thermal energy. When the engine is cold, the thermostat keeps the valves closed to let the powerhouse generate enough heat for power production. This device is a critical part of the cooling system and it needs to be well maintained as it can cause minor to major damages on engine parts and other related components. When it begins to fail, engine overheating could be unavoidable. If you want to make sure that this won’t give you headache, replace the stock thermostat of your Honda Civic with this quality Nippon Thermostat thermostat 78xC/172xF. This product is made tough enough to render efficient and longer period of service by the use of the latest technology and durable materials. You can easily obtain this replacement part through our user-friendly online catalog as we house large collection of Nippon products, including the G4000-64269 Nippon thermostat that’s perfect for Honda Civic 1998. Our well-trained team of customer service assistants is also available to provide you professional help. When you purchase your new Nippon thermostat from us, be also guaranteed to get the part at the soonest possible time.