My heater has'nt worked since I bought this car and I gotta fix it. The AC works fine but the heater blows regular cold lukewarm air when on. The guy I got it from was adament it was'nt the heater core which I specially asked and told him it was'nt a deal breaker I just wanted to fix it. He said that some mechanic he knows said he needed to blow compressed air thru his system and it should fix the problem. Does any of this sound right?? What could it be give me thermastat? heater core? I also have a leaking radiater around the end drain plug and also around a plug with a spring at the bottom of the other side of the radiater leaking. I just have to keep adding antifreeze every 2-3 days. I'm about to put in a del sol radiater this weekend could this be related??