Dear all... I'm facing a problem with the hvac system and completely broken.. Ac is running, semi Hermetic compressor, freon 22 is normal pressure 65/250.Blower rotation is good. Every duct is open, but still no cooling insdie.. I'm only 2,3 years experience in this field. And never faced such a problem before.. Pls help.. We changed the expansion valve also.. We try different positions for its sensing bulb. After expansion valve you can feel the chilled evaporator coil, but if I touch other pipe no return cooling at all.. Pls help me