Pressgrove
Active Member
There's only one HVAC unit available for the 12" screen trucks, so the "base" HVAC system is "THE" HVAC system that comes in Laramie and higher trimmed trucks.
I think it implies that the base level HVAC system was installed in trucks with a 12" screen (that should have been matched with something higher than base level), meaning there is no way for the 12" screen to control the HVAC system because they're not designed to work together.
Edit: It probably only mentions defrosting/defogging because that's all that really violates the FMVSS rule. There's probably not a rule for how well the heat and AC work, only how well you can see out of the windshield.
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