Q: No cold air coming from air conditioning.

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About 2 weeks ago I started noticing a random hissing sound coming from the passenger side of my 2008 Mazda Tribute. The sounds was completely random and sounded like pressure was being released from somewhere. About a week ago I noticed the air is not getting as cold so I assumed it was just low refrigerant. Finally got around to checking that and the pressure is reading way too high. I havent added any refrigerant or tested anything else. Any ideas of what I can check myself before shelling out $500 to have someone else check?

My car has 158000 miles.
My car has an automatic transmission.

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