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Hi Im David, yes low refrigerant charge will make the ac clutch to stop. your mechanic needs to hook up a manifold gauge set to the low and high pressure ports and see what the pressures are and then add refrigerant until the pressures are normal.
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low refridgerant can cause the low pressure switch to prevent the a/c compressor clutch from engaging. but have you checked the compressor to ensure it is operating properly. i believe it is the same relay as the horn relay so you could try swapping them and hitting the horn if the horn works then so does the relay.