1999 Chevrolet Tracker Q&A

1999 Chevrolet Tracker Question: a/c cooling fan

replaced rad,rad cap, thermostat, new heater hoses , new rad hoses and new a/c cooling fan now when i try to run the a/c or defrosters the cooling fan and a/c compresser pulsate -
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...n 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
Then cooling fan begins turning off and on. This is while not moving. Then A/C begins blowing warm air. What could be causing this?