Just bought a 2001 LSV8 and now I have no heat. I don't remember the heat not working during the test drive (also don't remember checking it). I had to have my antifreeze reservoir replaced and when I got it back I noticed my heat didn't work. The blower works, only it's blowing cool air when set to high. I also bled the system last night. While bleeding I had heat (well warmer air). This morning I start my car, and turn on the defrost at high and no heat. Any thoughts.