Pontiac Repair: heater blower motor diode, blower motor resistor, pontiac grand prix

Question
on my 2001 pontiac grand prix,the heater blower only comes on when on level 5.ive been told its the diode.i have the part where is it and how do i get to it.also i have a water problem in the passenger side floor when it rains heavy.i have heard it is a common problem in these cars.what could it be? thanks

Answer
Hi
The Blower motor diode aka Blower motor resistor or blower module, is located on passanger side, between the blower motor and firewall.
It is by no means an easy item to replace. The have 3 screws holding onto case. 2 are fairly easy the last one is located against the firewall and is very hard to get out and put back.
Does your car have a sunroof?
If so it could be sunroof drains plugged up.
I hope this helps.
Just advise from experience
Good Luck
Paul