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If its a single evaporator unit (front air only). then it is probably located in the condensor. If it is a dual unit (front and back), the front orfice tube will probably be after the "Y" in the compressor high pressure line, and prior to the accumulator. The rear unit does not use an orifice, but rather a Thermal expansion valve.

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Q: Where is the orifice tube in a 93 Chevy Suburban?
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