96 ford aerostar 4.0v/6 the a/c compressor wont come on and tested the low and high side switch and voltage is good but there is no voltage to the compressor plug on the clutch. where is the compressor getting it voltage from?

You may be low on R134a refrigerant, which means you have a leak.

Check control panel switch. Should be sending voltage to relays.

Here is a system overview. The low side port is #5 in the picture. Hopw it helps ya.. Cobra


Item Part Number Description 1 19972 A/C Compressor to Condenser Discharge Line 2 19E762 A/C Charge Port Valve(High Side) 3 19D594 A/C Pressure Cut-Off Switch 4 19D742 Evaporator to Compressor Suction Line 5 19E762 A/C Charge Port Valve(Low Side) 6 19E561 A/C Cycling Switch 7 19860 A/C Evaporator Core 8 19C836 Suction Accumulator/Drier 9 19835 Condenser to Evaporator Tube 10 19D734 A/C Manifold and Tube 11 19703 A/C Compressor 12 19712 A/C Condenser Core

power comes from fuse 6 to control head then to low and high pressure switches

Freon is what you are missing, our more specificly a refigerant charge that exceeds 45psi on the low side pressure line. This system has two pressure switches, a high side cut-out switch mounted on the rear of the compressor, and a low side or pressure cycling switch on the suction line.
Jump the low side switch contacts to ensure the electronics are sound for this system. If the compressor cycles, you know the system is low on a refrigerant charge. Turning on the AC is a request, and certain criteria must be met before the system operates as designed. Good luck

check the voltage to the alternator it could be low therefore draining your battery. You can do a voltage test at your nearby parts store free of charge.

You charge the a-c on the low side. If you are hooking up to check high side reading it is located to the right of the air cleaner and radiator. Good luck.

if your low on freon the unit will not work.low pressure switch cuts it off. or you have a bad a/c clutch asy.

Seems to be a very common problem with Ford. The wiring harness beneath the drivers seat contains the sensors for the airbag system. Go under the drivers seat and secure all the wires and clips. This makes most error lights for the airbags go away. Hope this helps and good luck!