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Hello, I'm Brandon.
There is an AC compressor and Air injection pump in the car. Which device are you referring to?
The Air condition compressor you don't need this unit to have the car run right.
The air injection pump is different, The purpose of the Air Injection System is to minimize hydrocarbon and carbon monoxide emissions during cold starts, and to speed the heating of the Catalytic Converter. By supplying fresh air to the exhaust manifold when starting a cold engine, the AIR pump helps to afterburn unburned hydrocarbon. This makes it possible to increase injection time and retard ignition which give higher exhaust temperatures, speeding the activation of the converter.
Without the air injection pump the engine would not run right.
Please rate me positive for the prompt service. Thank you!
Let me know if you have further questions.