Mustang question

Fuses are good.

look for a pressure sensor somewhere on the low side, might be in the accumulator even, it will have 2 wires, unplug it, start the vehicle with the A/C turned on, and jump the 2 wires in the plug, see if the compressor fires up, if yes, make sure you now have a full charge, as you might not have gotten a full charge with the compressor not running, if it runs, and it has a full charge, you need a new low pressure switch
 
there is also an a/c cut-out relay. that may be what we used to call a w.o.t. relay. just tossing that out there.
 
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