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Ultimately, the only real way to know for certain is to evacuate the system, recover the refrigerant, and weigh what's recovered. Extremely high pressure on both sides of the system is a good indicator of it, as well. If you don't have the means to recover refrigerant or a manifold gauge set and the know-how to use it, cavitation (shaking) of the AC system when it's running is another telltale sign.

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Q: How do you know an automotive AC is overcharged?
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