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My Sentra usually has ice cold A/C, but within the past week, it goes off and on randomly. The blue A/C light is on the button, but luke warm air blows out. Then I rev the engine, or accelerate and it comes on blowing cold air. When I decelerate, or stop it goes back to luke warm air. I am thinking A/C clutch or possibly compressor? Anyone have these symtoms before?