Q: leak to rear air cond. how to repair.,shop said dont know where leak is. on 2001 Chevrolet Express 1500

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shop said in rear for sure. Can this be repaired easy or must go to professonal.
(1) Answer
I don't recommend trying this one yourself. Dual AC systems can be a nightmare to service, even in a shop. If you don't know exactly where the leak is, and you don't have any leak detection equipment, you're just asking for trouble.