The fixed orifice is located in the inlet tube to the evaporator core, this is where the small high pressure AC line from the compressor connects to the tube sticking out of the engine firewall, u will most likely need a special tool to remove it, here is a web link to the tool, don't damage the evaporator core by trying to remove the orifice tube without this if it is stuck down in the tube.
http://www.google.com/products?hl=en&q=ac+orifice+tube+removal+tool&rlz=1R2ADBF_en&um=1&ie=UTF-8&ei=X4BETJiZC4-esQPw-ajJDA&sa=X&oi=product_result_group&ct=image&resnum=3&ved=0CCsQzAMwAg
Ac orfice tube location on a 1993 chevy silverado k1500 with a 5.7
SOURCE: where is the orfice tube located 1994 camaro 5.7
The orfice tube is located in the liquid line (discharge) of most ac systems. If your vehicle has one, thats where it is located.
SOURCE: Where is the air conditioning orfice tube located
Either in the condensor end of hoses or receiver dryer end of hoses. If hoses join in a union near dryer by firewall it is usually there between both unions.
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