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the orfice tube controls evaporater pressure in your a/c system, it also acts as a tiny filter. in GM cars they are hiding in the small pipe going in to the accumulator against the firewall. it is a silver/aluminum colored can about the size of a Starbucks large coffee cup. you can see where the tube is inside pipe by looking at tiny rectangle shaped dent on pipe. this actually retains the orfice tube in pipe. a/c auto techs usually recommend changing the tube during a/c servicing.

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Q: What does an orfice tube do on a 94 cutlass 3.4L?
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