Heater guru\'s...need some ideas Did a search and came up zip. My heater system is a A/C-Heater in a 75 burb, but I've removed the a/c pump, cooler and lines running to the condensor. I've replaced the stock 4 position fan switch (low, med-low, med-high, high)with a HD 3 position switch(low, med, high), and replaced all the vacuum lines, everything else is stock. Its the Four Season Vacuum System, and what is happening now is air comes out the defrost and lower heat vent no matter if the selector is on Heat or Defrost (Is this normal). Another thing I want to do is have it where I turn on the heater, I get air out of the stock a/c vents since I still have the a/c vents and duct work still installed (is this possible)? I do know that I need to replace the motor/fan and blower resistor (bearing is going on motor, fan is missing fins and I can blow harder than the high setting). Any ideas?