My air stopped being cold 2 days ago, up til then it had been fine... Last Summer I had to add Freon (I had just bought it and past AC history is unknown). About a can topped it off last summer. OK, so I figured small leak, and it need some freon... chunked some gauges on her, and the freon is just where it should be... hmmmm, so I swapped relay in the fusebox, and could hear the clutch engage the compressor, but no change on the gauge.... jumped the low pressure switch, and can hear the clutch click but nada.... no change on the gauge, no cooling. The compressor is not noisy, no belts flung off.... I am unsure how to proceed... I am wondering if the compressor locked up and burned the clutch enough that if clicks to engage but slips and the compressor is locked up, but how can I tell?