have air condtionar proplem can some one help me

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my car is gift from my uncle and the AC in the car does not working when i turn it on it is working but blows hot air and later i note that the air conditioner compressor is turn on and of on and of and it keep on that way and CAN YOU HELP ME AND Describe ME AUTO garage diagnose the proplem for free and guys if you could already help me and how much cost Approximately repaire and diagnose adress rancho cucamonga near garage guys