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If an a/c system is low on refrigerant it will cause the electric clutch on your compressor to cycle rapidly, which produces an audible click each time it does that. Some systems will do the same thing if too much refrigerant is added, as a way of protecting your system from too much liquid in the system, which would soon ruin the compressor.
So, too much R134 is as bad as too little. Get someone to put the guages on it so you'll know which problem you have.
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