I just got a 98 civic ex coupe. Been having problems with the cooling system and im not sure the dealer fixing it knows what they are doing. Its got new hoses, the top hose was the one that started the problems. It broke and ever since i have had trouble. So we put on all new hoses. The dealer (not a honda dealer) told me it was a sensor because the temp gauge isn't working. Sensor was replaced. I also had them replace the thermostat and the gasket to go with. The car was working fine for a few days then out of nowhere the temp gauge shot up and the car would not cool down. Its almost as if the whole system shut down. I dont recall the fan coming on, at least i didnt hear it, since they put on the new sensor,I did add some more coolant, (yes it did have coolant). Then i had to keep the heat on just to keep the temp in check. Maybe its the water pump or timing belt. Maybe the sensor they put on is faulty. I really need help.