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I have the same problem also. I had the same problem with a Jeep I owned previously. There is a sensor in the center of the instrument panel that is supposed to guage infrared heat of the front passengers.
It was my theory with the Jeep that it started to see the heat from the instrument panel and adjust the heat down even though I still wanted up. It seems the 300C has the same attitude. Once again just a theory.
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Don Bright Silver Loaded Mesh Grilll
Borla cat back
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