This following isn't really technical but I hope the information helps.

While investigating blower motor noise, since the glove box and trim panels were removed, I took a look at the A/C air intake, as I was annoyed that outside air/fumes entered the car regardless if A/C was on or off. And by accident (didn't have a manual at this time) I found that the main air flap which controls the air intake weren't working due to bad switch-over valves, it had stuck open so there were no "recirculation" mode, which in turn resulted in reduced cooling. Upon replacing the valves the system did blow colder than before, as air is recirculated as required, thus had no need to cool the hotter air from outside all the time.