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4th Gen Ram Tech2009 - 2018 Rams and the 2019 Ram Classic: This section is for TECHNICAL discussions only, that involve the 2009 - 2018 Rams and the 2019 Ram Classic. For any non-tech discussions, please direct your attention to the "General discussion/NON-tech" sub sections.
I cannot locate any info, but does running the A/C NOT allow the MDS to work? I do not have the fuel saver light (yet) but it seems to me if we run the A/C the MDS doesn't activate. Maybe I'm wrong?