where is the orifice tube located in my car?

Actually, it's in the high pressure line where it goes into the evaporator. Any point after that is considered 'low side'.
 
The Orifice tube is in the low side line. You can't get at it you have to replace the line. Call the dealer parts man he can help. I know that sucks but I pulled my hair out on that one already.
 
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