Hey man, try using a multimeter to test the clutch wire on yer compressor (blue) too see if its getting the 12ish volts to it... if not then yer low pressure cutout or high temp switch could be faulty. If u are getting the voltage and yer not clutch isnt engageing then i reckon its time for a new compressor :)
*Edit* Tho i think its yer compressor clutch coz u mentioned the engine reving up or whateva and that usually takes the signal after these switches, so it would seem yer getting that 12V at the compressor..
EB1 3.9L MPI Falcon Wagon with converted T5 / Pacemaker & 2.5" Redback sports exhaust / 2" lowered blocks at the rear, Kings lows up front / ED Tickford Head and Cam / K&N panel filter with XH intake Snorkel / Full EL Fairmont interior with woodgrain
89 EA1 3.9L TBI Falcon Sedan with 3 speed auto / currently being upgraded...