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it's either low (in spite of your readings) or your a/c clutch is not working correctly or you have too big an air gap in the clutch.
First, just disconnect the 2 pin connector from the a/c pressure cycling swithc and jumper the 2 pins with a wire to force the clutch to stay engaged. See if it blows cold then, and stays engaged. You can run this way for about 15 minutes before you have to pull the plug.
It is best to buy a connector pigtail for Ford, but you can wire directly using the below color code for the factory wiring. use the color code from the pioneer to match to the factory wires. If you have more questions, please reply.
1994 Ford Aspire Car Audio Wiring Diagram
Car Radio Battery Constant 12v+ Wire: Blue/Red Car Radio Accessory Switched 12v+ Wire: Blue/Yellow Car Radio Ground Wire: Black/White Car Radio Illumination Wire: Red/Black Car Stereo Dimmer Wire: N/A Car Stereo Antenna Trigger Wire: N/A Car Stereo Amp Trigger Wire: Light N/A Car Stereo Amplifier Location: N/A Car Audio Front Speakers Size: 5 1/4? Car Audio Front Speakers Location: Doors Left Front Speaker Positive Wire (+): Brown/Black Left Front Speaker Negative Wire (-): Green/Red Right Front Speaker Positive Wire (+): Green/Orange Right Front Speaker Negative Wire (-): Blue/Orange Car Audio Rear Speakers Size: 5 1/4? Car Audio Rear Speakers Location: Side Shelves Left Rear Speaker Positive Wire (+): Blue Left Rear Speaker Negative Wire (-): Yellow Right Rear Speaker Positive Wire (+): Pink/Blue Right Rear Speaker Negative Wire (-): Brown/Red
There is a low side pressure switch on the dryer,remove the plug in connector and use a wire to connect the two circuits together on the plug,if the ac compressor runs,and the ac cools fine,replace this switch,it just unscrews,and you will not loose any freon.
the only other thing in the circuit is the pressure switch...unplug/ jump across the connector of the switch to verify circuit integrity and go from there...sometimes this is neccessary to charge freon fully so compressor will stay running to draw freon in the low side.
First thing to check is the fuse. Next ---If the freon pressure is low the compressor clutch will chatter. If the freon is all gone or very low, the pressure switch in the system will not allow the clutch to get power, so will not turn on. Or it could be the switch in the dash board. If you pull the electrical connection at the clutch, then with separate wires and alligator clips run power direct from batter to clutch --the clutch will throw in if it is good. If so, you will know it is probably the pressure switch. If you have good pressure, then it could be the pressure switch itself has failed.