Buick/Olds: problem with a/c, buick riviera, dual climate

Question
I have a 99 Buick Century with digital automatic dual climate control and when I run the a/c I have about 8-10 degree differance between the two side's do you have any suggestions or know how to test this out?    Thank You, Dave

Answer
Great quesion, Dave.
No, I don't have a method to test out this problem, but I do have some possible solutions.  Let me first explain why your question is so great to me.  I have a 99 Buick Riviera that has the same problem.  I don't think it has anything to do with the dual climate control...at least I didn't until you email me with the same problem.  I was thinking that it had something to do with a vacuum line of some sort or a clogged hose somewhere, but I will try to replace the dual climate control relay and see if that does that trick.  I will keep you updated on what I find and you do the same please.

Thanks,
Ray Barham