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I would check the temperature flap door to make sure it is changing from heat to cool. To confirm A/C is operating right, you can feel the two hoses going to the firewall, one will be ice cold and the other should be pretty hot.
Does this actually have a clutch on the A/C compressor or is it a variable compression model? Often it will look like the compressor is turning, but if you look at the center bolt it may not be turning. In that case your compressor is seized internally.