I don't have an answer but I do know that my 2002 QX4 blew but didnt cool and I replaced a fuse and it cooled but it wouldn't stop blowing. The situation now is, if the AC if "off" the air blows whatever temp it is outside, as it's Texas ,that usually means HOT. If you turn the AC "on" the air will cool. The only "PIA" is that the speed stays on high regardless of whether the AC is on or not, this can be very annoying.
So, if you find out how to turn that blower down, please respond. :)