I tried to use my defroster the other day and there was no heat. This is in a 2003 MCS. I removed the interior panel to gain access to the heater core and I started the engine and let it run for a few mins (normal operating temp). I felt the heater core and pipes coming into it and they were really hot. The air is still not warm like it should be. Any suggestions? Car runs at a great temp. No issues now. When I bought it I discovered that it had a cracked head and that has been repaired along with new tstat. Need help before winter thanks.