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Hmm, I had a similar recurring problem with my 2008 Impala. I think it was actually fairly common with the later w-bodies (Impala, Grand Prix, LaCrosse). Maybe the Lucerne used the same HVAC system? By the way, I found a TSB for your problem: 99-01-39-004D AUG 11, also issued for the 2007 LaCrosse and Impala. IIRC, it had to do with condensation on (in?) the cabin air filter.
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