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Why would you want to bypass the compressor? Do you mean to bypass the shut off switch? If the system is low on refrigerant you can bypass the switch by removing the plug and jumping it with a paper clip. Running the system when it is low on R134A would mean it is also low on oil. I recommend adding a oil and refrigerant charge.
there are too levels for refrigerant that affect the ac compressor . one is too low which you see and the other is too much. both control pressure switches tat work the ac clutch. IT is best to have a refrigerator /air conditioner mechanic add the gas as they will check out the system for leaks which you have
It sounds like you've done just about everything except to check if there is a bad or intermittent wire causing this or perhaps your low-pressure safety cutout switch is possible going bad causing the compressor to kick on and off?
Your have a low refrigerant level. Econ staying on and service ac will stay on too. Sounds like you didnt put enough r134a in the system. How much r134a did you add? Capacity is 38 ounces(thats with R12), and a bit less than that for r134a.
Yes, if it is like my 1990 cadillac deville, you must first disconnect the battery for 3 or so minutes and reconnect it to clear the error message and to reset the a/c system so it will turn on when R134a is added under pressure.
Cadillac did that in 1990 so the compressor would not run without refrigerant in the system. It's a safety feature designed to save a compressor if there is a leak in the system.
If you try to add refrigerant without resetting the a/c system, then the compressor will not engage.