hey my 71 eldo does not have ac because one of the air duct pieces on the fire wall was broken once. i dont want ac anyway its a convertable. but the heater i need. i made a new tunnel for the air to enter the fire wall through from the blower and i get heat blowing out at my feet but not out of the top vents in the dash. it will blow if i put it on vent but then cold air mixes with it and defeats the purpose, and the blower seems really loud but the car heats up so slowly. does anyone know whats wrong?