hey Scotty, my wife has a little 02 civic Lx and recently the car started overheating when sitting at a stop light, once we drive it goes back down, then gradually over the course of a few days it started overheating (temp gauge rising) while driving! We checked coolant level and the coolant in the radiator is gone and the reservoir is completely full! And was leaking out a little too (from lid) I’m thinking head gasket is beginning to go? Causing compression to be pushed into the cooling system and pushing coolant into the reservoir? Or would it be something else? We replaced coolant and filled it up and bled it with heater on high and making sure all air was out as much as we could and we replaced thermostat
odds are fans are not working on the radiator.