1999 Chevrolet Tracker Q&A

1999 Chevrolet Tracker Question: a/c cooling fan and a/c copresser pulsateing

hello i just replaced new rad,new cap new thermostat, cooling fan and both rad hoses and heater hoses now when i run the a/c or my defrosters my compresser n a/c cooling fan pulsate causeing my engine to run poorly -
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