The AC in my 2002 grand Prix works some what on the drivers side but is warm on the passengers side. I looked at the little things that tell the air which way to go and they're working on both sides. What could be my issue? How do I trouble shoot? Also I used to have the dual climate control stick things but converted to the single temperature control knob. The AC turns on one side but not the other so I don't think my swapping parts had anything to do with it. I'm guessing an AC leak or something.

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