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1988 944 Turbo Engine making air release noise

Heating and Ventilation

Vehicle Information: Model(924/944/968): 944 turbo; Year: 1988; Body Type: Coupe; Total Mileage: 83000;

This is going to be a tough one but any help would be great. I just recently had the air conditioning recharged and fixed do to a vaccum hose problem. he plugged up a y connector and it worked. but the car makes a air releasing/leaking noise whenever i drive but its not consistent and I'm not sure why it does it...sometimes it doesn't make any noise but sometimes it's loud and very annoying. All I do know is that when ever I press the A/C button to the off position (the one that looks like a snow flake) the noise comes on like its releasing pressure and it keeps going...and goes on and off...but when I press the A/C button on the noise instantly stops and I can feel the engine working harder. but then again when I'm driving I hear the noise regardless..button on or off. And if it helps at all the noise is coming from the front driverside of the car.

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