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Welcome to AF!
doesn't the '99 have instead of a standard resistor, an actual control module?
has this been checked? if the blower is benched, and spinning, and you have already swapped out the head unit, the control module is what I'd look at.
also, if your shop does not subscribe to AllData, or McLarens, call another shop local that you do business with, and see if their is any TSBs on the '99 DeVille. I know that the Auroras were having problems with A/C blower systems, might search their forums.
hope this helps,
chris
nrt racing
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