The problem is there is a leak in the 134-a refrigerant system and the level of refrigerant is low so, the low pressure sensor is reading too of a low pressure in turn causeing the low pressure switch to turn the power off leading to the compressor.
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You'll have to check to see if the compressor clutch engages when you turn the A/C on. You'll hear a click and the center of the compressor will begin to turn. If it does the system has Freon in it but may be low. If the compressor does not engage the system may be out of Freon or have an electrical problem.
if you have good pressure good 134-a and you don't here compressor kick on make sure it is getting power check fuses relays also make sure it is plugged up aif yes to all the compressor is most likely shot to much pressure could make it not work
If the noise started after you added the Freon, then it perhaps is your AC clutch. Normally if you have an automatic AC system, then when the Freon gets low, the auto system will not allow the AC to engage, only allowing the fan to circulate outside air. In order to add Freon to the system, the AC lock out has to be over ridden, in order for the compressor to **** in the Freon. This in turn engages the AC system so that the clutch engages, thus engages your AC system. The clutch bearings may be at fault.
Once it is engaged unless you are hearing any unusual slipping noise there is no reason that the clutch can go bad.
Start the engine rev up asking someone to be within and switch on AC to idle, now rev up the AC. If there is no visible signs of the RPM of the compressor dropping off the clutch is good. However if there is problems relative to cooling it can be failrue of the compressor, clogged evaporator or leakage of gas.