I recently bought a 2004 Honda Civic, I have only had it for about three weeks. At first the heat would get hot while I was driving, then I noticed when I would stop at a red light or idle it would get cool, so I added some anitfreeze that worked for a little bit, then it stated doing it again so I stared pushing the recirculation button heat worked fine for two days air worked really good. This morning I go out and let it warm up when I got in the car, the temp gage started going up it did not over heat but got warmer than usual turned the heat full blast it went down but the heat never would get warm. Tonight let it set and run for twenty mins still no heat but the temp gage started climbing again but did not overheat turned the ac on full blast temp gage went back down and I got it home. Over flow take is full couldn't really tell much about the radiator but still have no heat what so ever... This is the first Civic I have owned I have had three Accords and never had any problems like this HELP ME please

 

Nobody has any suggestions