I have a 2006 Subaru Outback with the normally aspirated 2.5 Engine. When I turn on the AC, it was blowing warm so I put one can of refrigerant inside of it. It blew slightly cooler but the AC compressor would click on and off rapidly, signalling a possible overcharge. I released some of the refrigerant through the low service port and that took care of the compressor clicking on and off rapidly. When I turn on the AC now the compressor runs but still warm air. Anything else i could be missing?