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Re: 97 sunfire ac problem
First, 4 ounces of refrigerant oil in an evacuated system is too little.
Second, three 12 ounce cans of R134A (36 ounces) might be too much. The system likely requires between 32-40 ounces. If the 4 ounce oil charge also contained 6 ounces of refrigerant, the system may be overcharged. If you used liquid PAG administered via a hose, it might be O.K..
It is possible that the PCM is not enabling the AC, or that the low pressure cutout is not enabling the AC.
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