2000 Pontiac Grand Prix GT Blower not working

I've been plagued with a blower problem with this car. Several years
ago, I replaced the blower resister due to one speed not working. A year
or so later, same problem...and again and again. Each time I replaced
the blower module, there has been a new design module. This latest round
is causing me problems. Last year when I replaced the module due to the
second speed not working, the replacement instantly worked. Months later,
different speeds began flaking but eventually worked. This spring, all
speeds, including high, mysterioulsy quit working. Playing around with
the speed control, I eventually got it working again. What I did notice
on this round is that when my blower does not work, my AC and rear
defroster also does not work. When selecting high speed or putting the
switch in the off position, I can hear a clicking like something being
shut off.

Today I replaced the module again. After the module was installed, I
expected everything to work....NADA. No blower, A/C, or Rear Defroster.
I got on the phone with my parts store to see if they again had
defference revs of the module. While I was speaking to him and playing
with the blower switch, everything began working.

Does anyone have an idea of what can be going on? Has GM had a recall on
these module that maybe another piece of equipment also needs to be
replaced?

stumped....-jf