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2003 Tahoe AC Problem

Had the compressor replaced in Aug 07. AC worked just fine until May 08. Starting blowing out warm air with an old AC smell. In mid May I had the ‘head’ (part that is in the dashboard) replaced. It worked for two weeks - not great but it put out cold air, then a minute or two of warm air w/ the smell again. Yesterday it stopped putting out cold air completely.



Any ideas?

Is the compressor still running? Still have blower speed control from head? Do the lights on the head still light up?Why did you replace head? (blower speed switch broken?)