a/c light blinks on and off on 1992 Chevrolet 1500 Pickup

my a/c wont cool and the a/c light blinks on and off on control panel

Asked by for the 1992 Chevrolet 1500 Pickup
Most likely caused by a low refrigerant charge. The air conditioning system works on high pressure if the pressure drops just a little the air conditioning efficiency drops dramatically. You will have to have the pressure checked, refrigerant added and or any leaks in the system repaired.