Pontiac Repair: blower not blowing air through vents, pontiac grand prix, drain hole

Question
QUESTION: I have a 99 pontiac grand prix.  I replaced a faulty blower motor, but not nothing is blowing out of my vents.  I can here the blower motor come on when I turn the unit on, and can hear a difference in each setting (1-5), so i know it is working, but i can barely feel anything coming from the vents.  This has also caused a leak in my passenger side floor, which is coming down through the blower motor.  I am assuming ice is building on the a/c unit, since the cold air is not blowing out, then thawing when i park the car.  Any ideas as to what is going wrong?

ANSWER: Hi Dale:
does the fan work if the a/c is not on meaning if you put the hvac on vent and the a/c off does the air flow okay out the vents? If so then it only stops blowing when the a/c is on chnaces are the evaporator is freezing up. That can be from a system that is low on a chage to a control valve in the compressor being bad. if the blower doesn't blow even on vent with the a/c off you have some sort of blockage in the hvac assembly or a door that is stuck. Hope that helps you out. Oh P.S. if you have water leaking into the car the drain hole in the fire wall for the heater box is plugged up.
good luck :)


---------- FOLLOW-UP ----------

QUESTION: Thanks for the reply.  To answer your first question, nothing is blowing from the vents on any setting, with or without the a/c being on.  Prior to putting the new blower motor in, the old one was working fine and air was flowing through the vents, the only issue was that it only worked when i hit a bump and it would shut off on the next bump, so we thought it was a short.  It was literally working fine, in the 15 minutes it took to undo the three screws and drop it down and put the new on in, it quit blowing out of the vents.  Do you think it could be a door that is stuck.  Is there a diagram showing where the doors are located so i can check this?


Answer
Hey Dale:

If this happened after replacing the motor and nothing else was done to the car. Here is a dumb idea. if the motor is incorrect for the car maybe the direction the motor is spinning is wrong. maybe is sucking instead of blowing. and that is why you have no air flow.... If the motor is an aftermarket one maybe the rotation of the fan is wrong or the fan if incorrect... Before you go diving into this anymore look at what you did to make this happen... Just a though..