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The expansion valve (orafice tube) controls the flow of refrigerant. If it's not working then the compressor would not go on. Did you check the surface of the condensor and the radiator? Kinks in hoses? Leaks? Drive belt tension? The blower motor and Fans? Why don't you go to a certified automotive A/C technician rather than changing parts at random? It may be cheaper in the long run.
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