Ive just replaced water pump, upper and lower radiator hoses, and just before that the coolant elbows. My concern now is when I turn on the heater it works for defrost mode, blows great but in heater mode there is no air blowing on my feet. I know it worked before all this, the AC isn't blowing down there either, even though it sounds like it is. Am I looking at a fuse issue? or is it somehow plugged up ? Im frustrated and tired of the mysteries. Any advice?