Q: air leakage with a/c on 1996 Nissan Altima

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the car is making an air loss sound while driving with air conditioning running. does not occur when idling
(1) Answer
Really you need to have your Climate Control System Diagnosed. Here is sheet that we at RepairPal put together to help you or your shop with this process.

it is a comprehensive inspection of the entire system

here are some shops: