ok so i purchesed my saab about a month ago and been hanging around here since. but now its starting to get chilly i was checking out the heater to see if it worked, and well it does nothing but blow out chilly air. if i do the diagnostics then i get 0 codes but the air gets warm momentarily after the diagnostics. then it slowly gets just chilly again like outside ambiant temp. any ideas dont want to freeze this winter.