A/C Won't Work

When I turn my ac on I don't hear anything I tryed filling up with freon but I think it comes out my muffler or something because I see it comin out the back of the car if some can help I would apprciate it

If the freon comes out of the exhaust, your putting it in the wrong place!!!! Your exhaust and A/C systems are totally independent.

Yea but that's the only place u can put it mabe its comin out of some where else and its leaving from under the car ho would I test a leak or know it a compressor works