A/c was fine for a year, then began intermittently blowing warm air. Noew only blows warm air. Thought maybe low refrigerant so when I had the oil changed, I asked the tech to check it. They checked, and said that the pressure was already high. So had a mechanic friend bleed off coolant but found it didn't work. Still blows warm air. We think there is a small leak in the compressor. Picked up a new one at the junk yard will update when we get it replaced.