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Did you check the relay to see if it is getting power and ground ? Is the high pressure switch working correctly ? The low pressure switch opens when the pressure drops below 20psi, and the high switch opens when the pressure is above 300psi.
Normally you would check for voltage at the relay then the low pressure switch, then the compressor clutch. With the system charged or the low pressure switch bypassed you should have 12 volts at the clutch and ground. You can also check the clutch with an ohms meter to see if the magnet is open.
A mechanic would start at the compressor and work back. Did you jumper the low pressure switch, or the relay, or put power directly to the ac clutch ? You have a low pressure switch that should be closed and a high pressure switch that should be closed to put power to the compressor clutch. If the freon pressure drops below 20psi the low switch opens, if it goes above 300 psi the high switch opens.
I would check the freon level in the AC system. The computer looks at the voltage from the pressure switch in order to activate the compressor clutch. If the voltage is not in the right range the computer will not turn on the compressor and in turn will not turn on the cooling fan. It is set up this way in order to prevent damage to the AC compressor. I would almost bet that the system is low and may have a small leak. Your local mechanic can check it for you and correct the charge level as needed.
you don't have enough pressure in your system. odds are you have a leak someplace and the factory installed a saftey switch to keep the ac from running when there is no pressure. This way you don't end up burning up your compressor.