I have had this heating issue for a while. I am blowing cold air when the car is already at normal temp but while I was driving on the highway, it blew hot air. I did my research and thought it could be a heater core that was clogged. So I unclogged it and bleed it. I then drove it around to make sure all air was out of the system... After that I realized that both the inlet and outlet hose going to the heater core has no fluid at all. Now, even though I'm driving on the High way, I do not get hot air. The heater core is BONE DRY!!! I had also already replaced the coolant flange because it was leaking really bad. WTF is the problem. HELP!!! SOS!!!