Ac compressor turns on and off

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In most case this is caused by low refrigerant pressure in the system which is caused by a leak in the system, this causes the compressor to turn on and off quickly with decreased cooling especially near idle or low speeds. You must have the system leak tested and repaired and then recharged with the correct amount of R134. This is only an educated guess so please have a local shop confirm it before replacing any parts.
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