hey all, I'm new to this forum but I've owned a 1976 300d for the last three years. I have been slowly but surely bringing it back to a somewhat restored state. There is one problem that I have been puzzled about for some tim. I can get hot air to blow from the foot vents, but non to come from the ddash or defroster, It just blows cold. If any one has a clue it as to what it could be it'd be appriciated.