Reference the subject vehicle, yes. Perhaps your comments were in reference to some other unspecified model. The thread that you referenced was discussing an '86 300 SDL. I am not sure how that relates to questions posed by the originator of this thread.

On the '82 300 SD, there are two switches on the receiver/dryer-the r/d temperature switch and the compressor low pressure cut-out switch. The temp switch closes at 126 degrees F, energizing the aux fan via the aux fan relay. The low pressure cut-out switch opens if the refrigerant pressure drops below 10 psi, removing power from the a/c compressor. The pressure switch is not directly tied to the operation of the aux fan. The fan is either off or on; it does not run at multiple speeds.