Cadillac Repair: 94 cadillac eldorado blower, cadillac eldorado, quick responce

Question
QUESTION: Hi I have a 94 cadillac eldorado.my problem is the blower does no blow out of the front vents.the defrosters blow and the rear blower works fine.I have been told it may be a manifold vacume line.any help would be greatly appreciated
ANSWER: The front vents (face vents) do not blow out heat, Only AC.

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QUESTION: the face vents do not work at all.( no AC or heat)
Thank you for the quick responce.

Answer
There is a problem with the upper mode valve whereas it is either:

faulty.
Loss of vacuum to the blue hose.
internal fault of the programmer.

I can provide pictures and test procedures for you to follow so as to locate your problem.

E-mail me at: onlineautohelp@msn.com and include all of this information and vehicle year and model.