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If you put sealer in the system and then opened it up and let air contact the sealer, it has likely hardened into thick goo throughout the entire AC system. you may have to replace a lot of components to make the system operational again... I would suggesttaking this one in to an A/C shop for an accurate diagnosis of what is needed. If you replace just the orfice tube, it will likely just clog up again.
Sealers are bad news, and should never be used in an A/C system unless the vehicle is one step from being scrapped as a last resort due to problems such as this...